Mr. Li is a famous mathematician in modern Chinese history. He was diligent in thinking since he was a child, and he showed extraordinary intelligence in his childhood.

One day, he and his father visited a gentleman's house in Haining and saw a picture of "Birds Returning to their Nest" hanging on the wall. This painter was a famous master of flower and bird painting at that time. In his wonderful pen, people who look at paintings seem to smell flowers and hear birds singing. There is also a poem in the upper right corner of the painting:

One by one,

Three, four, five, six, seven, eight.

There are so many birds in Phoenix,

Peck out thousands of stones on the earth.

This poem is very ironic. Young readers know that there were many officials, large and small, in old China in feudal society. They spend money like water and suck up the fat of the people, as the folk song says: "Three years to clear the magistrate, 100 thousand snowflakes and silver." These officials, like sparrows, stole all the food from the people!

After seeing this painting, Li's heart also moved to reason. He not only understood the meaning of this poem, but also noticed something else. It seems that the characters in the poem are deliberately arranged by the poet. Besides the known meaning, are there any unknown secrets?

Looking at these figures, he thought and thought. When I got home, the poem still lingered in my mind. What do these numbers mean? When he wrote this poem again, he suddenly realized that several formulas appeared in his mind:

1×2=2; 3×4= 12;

5×6=30; 7×8=56;

2+ 12+30+56= 100

The answer is exactly equal to 100. Isn't this the word "birds return to their nests" exactly the same as "the finishing touch"?