For Li Shimin, Fang Xuanling and Du Ruhui's performance can be called rigorous.

From his own level alone, the arithmetic level in the compromises can be called superb, but fortunately, the final conclusions are easy to understand, and he can figure it out after hard thinking.

The two courtiers first listed the number of households in the former Sui Dynasty, every five years, and finally sorted out a complex formula, calling it "calculation model", and calling this step "taking the cause".

The second step is to use the numbers of the first year of Wude to calculate the growth of the number of households in the Tang Dynasty according to this "calculation model", which is called "fruit test".

The calculated numbers are listed on the left, and the number of households taken by the Ministry of Civil Affairs is listed on the right, and the two sides are intuitively compared, although there is a difference, but it is not big, and these means can be called shocking to Li Shimin.

Of course, this calculation may not be accurate, after all, Tang Sui's household compilation policy was very different, and Yang Guang and Li Shimin also had completely different attitudes towards the inventory of hidden households.

But it at least offers a glimpse into the future.

In terms of folding, the number of households adopted by the Ministry of Civil Affairs has ended in the fourth year of Zhenguan, and the rest is blank, but the numbers calculated according to arithmetic continue to move backward.

Moreover, Fang Xuanling is also quite "intimate" and lists the number of acres of land that each household can have.

According to this calculation, until a hundred years later, the people of Huxian County only had 20 acres of fertile land per household.

Twenty acres of land is only enough to support a son and a daughter, and if you consider the problem of land annexation, which cannot be calculated by arithmetic, this figure will only be even more unsightly.

And what time will it be after 100 years? It was the collapse of the Tang Dynasty, the flight of the Son of Heaven, the fall of Chang'an, the collapse of the princes, the death of the elite in civil strife, the death of the people in the Tang army, and the people who the Son of Heaven promised to plunder Chang'an.

It was an unimaginable piece of history for Li Shimin, and now his two prime ministers have not calculated carefully, allowing Li Shimin to get a glimpse of the corner of the people's livelihood at that time.

The hundred-year-old Tang Dynasty was extremely prosperous, but all this seemed to have little to do with the water carrying the boat.

So in the end, these people, who were as warm as water, turned into angry waves and overturned the giant Tang Dynasty's boat.

Empress Changsun listened quietly to the emperor's narration there, seeing that he was sometimes heroic and sometimes mournful, and finally ambitious and restrained, as if he had a new goal.

"In this way, the prince should also know a thing or two of arithmetic." This was the first thing that came to the mind of Empress Eldest Sun.

Li Shimin also agreed, the only doubt was that he didn't know if Fang Xuanling was willing.

After briefly finalizing the matter, Empress Eldest Sun also asked curiously:

"Previously, everyone asked ordinary people how much they had children, and this is because of this problem?"

In this regard, Li Shimin sighed again, shook his head and said:

"In addition to calculating the number of households in the county, Xuanling Keming also calculates the increase in the number of households in one household."

However, this question is quite troublesome to say in words, Li Shimin simply ordered on the spot, ordered the waiter to cut off the branch as a finger-long short stick, and hugged two large ones.

Pointing to these short sticks, Li Shimin smiled:

"If you put a short stick on the ground, Guanyin thinks that these short sticks can show the generations of descendants of a family?"

This description is general, but Empress Changsun can also understand what it means, and after a visual inspection, Empress Changsun hesitated and said:

"Come to think of it, enough to pose for more than ten generations?"

Then Empress Changsun saw Li Shimin standing there laughing, laughing so much that she didn't know why.

The chamberlain quickly began to toss these short sticks, according to Li Shimin, put a pair of short sticks at the top as the first generation, and then placed three pairs of short sticks below as the second generation.

Then repeat this and so on, with three pairs of short bars placed below each pair.

And as it was placed, Empress Eldest Sun gradually widened her eyes in surprise.

Li Shimin sighed with a sigh on his face, looked at the short stick on the ground, and recalled the recital written by Fang Xuanling:

"Looking at the records of the household department, take the number of one household into three households, and pass on the Taiping foot for five generations in a hundred years, then one household can become a hundred households, and later generations call it infinite, and the minister thinks it is appropriate."

And in the end, Fang Xuanling also offered his own suggestions:

"If we don't make the country strong and the people poor, we will fix the equivalent amount of cultivated land and households, and follow the example of the empire in the name of Britain in the West Pole in later generations, and carry out the government of opening the sea to vent the people's strength."

After exceeding the boundary of more than 100 years, Fang Xuanling also simply calculated the numbers behind, and Li Shimin remembered those huge numbers very clearly.

The sixth generation is divided into more than 200 households, the seventh generation is divided into more than 700 households, the eighth generation can be divided into more than 2,000 households, the ninth generation is more than 6,000, and the tenth generation is nearly 20,000.

These calculations are idealistic, completely ignoring factors such as disease, natural disasters, land annexation, and sudden war.

But Li Shimin also understood better that the more peaceful and prosperous the times, the less likely the people would suffer these accidents, and the faster the population would grow, which eventually overwhelmed the land and led to the end of the dynasty.

Moreover, the common people will suffer from these factors, and the princes and nobles will still be able to reproduce a large number of children even when the power of the country is weak, and these descendants will occupy more land than the common people.

Thinking of this, Li Shimin inevitably remembered the Zhuge Wuhou who watched the light curtain with them, and his lord: Liu Bei.

Its ancestor Liu Sheng, King Jing of Zhongshan, is the best illustration of this set of figures.

Although many descendants have declined, now the folk have said that half of the ancestors of the Liu family are now the king of Zhongshan.

However, thinking of Emperor Zhaolie and Zhuge Wuhou, Li Shimin couldn't help but be curious:

Now that there is the help of the light curtain, and the Hu people have been disabled, I think that at this time, I should have drunk Ma Hanhai and regained access to the Western Regions, right?

The next time you watch the light curtain, ask Okay, Li Shimin made up his mind.

On the other hand, Empress Changsun also silently made up her mind that she would not ask her sons to be proficient in arithmetic, but at least know a thing or two about arithmetic.

The twists and turns of Fang Du and the others caused a lot of shock to Li Shimin, and the most direct impact was that in December, seeing that the four years of Zhenguan were coming to an end, the emperor issued an edict to further strengthen maritime politics.

The officials are naturally bitter, after all, the end of the year is already busy, and it is good to only listen to the new order issued at this time, if it falls on the head, I am afraid that it will be difficult to live in peace during the ten days of the New Year.

But no matter how much you complain, you still have to implement it, but this time the maritime policy has made the Shandong maritime merchants excited.

In the past, maritime policies were for shipwrights and shipwrights, but this new policy has added an unprecedented decree on the leasing of government ships and people.

The common people could organize their own sailors and go to Dengzhou and Laizhou to rent official ships, and in the first year, they needed to go to the designated places to do errands according to the assignments of the naval divisions of the two places.

After one year, if you pass the assessment, you can sail freely to sea, and you only need to pay 40% of the goods to the seamaster every time you return to the sea.

The surnames of Shandong are all disdainful, the risk of going to sea is too great, how can there be incense from forcibly seizing and embezzling land?

But for the people along the coast of Shandong, they are too interested!

Perhaps because of the obvious tendencies of the maritime administration, when the Yuan Zheng celebration at the end of December, Li Shimin could feel that the envoys of the Western Regions were hiding a mess of thoughts.

Fortunately, the Tang Dynasty seems to have turned its attention overseas, or has no time to take care of other things, such as Gaochang.

The small countries that hoped that Datang would enter the Western Regions and support it were also afraid that Datang would not be interested in the Western Regions and would lose their backers, such as Qiuzi.

Li Shimin was not even interested in watching coldly, and after the busy Yuan Zheng was over, he simply hid back in the harem, coexisted with Guanyin, and had fun with parents and children.

Early in the morning of the third day of the first lunar month, Li Shimin couldn't wait to go to the Ganlu Hall and issued a summons to his ministers who were still in Chang'an.

(End of chapter)