A prince learnt magic, with great effort, so that he could dig and find a treasure.
One day, with his magic, the prince found a treasure on the bank of the river Gianquadara, in Italy. He decided to dig the treasure out. For that the prince needed to make ten billion ants cross the river one by one, on a small boat made of half a shell of a nut.
The prince quickly found a nutshell. He also found an anthill with millions of ants inside it. The prince put one ant on the shell and made it cross the river. Then he put the second, then the third and then the fourth.
What happened next? We can only know that when all the ants have finished crossing the river!