Divisions

David is a young boy who loves numbers. He recently learned how to divide two numbers, and since then he divides all day long. When a division comes out as an integer he is happy, and when it does not he is much less amused. After a while he decided to use only one dividend per day.

David's parents are careful, and they want him to get enough happiness, so they pick the number he uses as that day's dividend. There is still a problem: the parents are not good at math and cannot count how many positive integers divide a given dividend $N$ with an integral result. Count them for David's parents.

The single input line contains one integer $N$, the number chosen as the dividend. ($1 \le N \le 10^{18}$)

Print how many positive integers divide $N$ with an integral result.