1973 阶乘中因子2的个数


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Points: 100
Time limit: 1.0s
Memory limit: 32M

Problem types
Allowed languages
C, C++, Java, Python

Description

欲计算n!中因子2的个数,请你下重手。

Input

一些整数n(n<400000)。

Output

对应每个阶乘值n,输出因子2的个数。

Sample

Input

5
53

Output

3
49

Source: qn


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