Problem E: Relatives

Problem E: Relatives

时间： 1ms        内存：128M

描述：

Problem E: Relatives

Given n, a positive integer, how many positive integers less than n are relatively prime to n? Two integers a and b are relatively prime if there are no integers x > 1, y > 0, z > 0 such that a = xy and b = xz.

There are several test cases. For each test case, standard input contains a line with n <= 1,000,000,000. A line containing 0 follows the last case.

For each test case there should be single line of output answering the question posed above.

输入：

输出：

示例输入：

7
12
0

示例输出：

6
4

提示：

参考答案：

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