OpenJudge

8:Relatives

总时间限制:
1000ms
内存限制:
65536kB
描述
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.
输入
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.
输出
For each test case there should be single line of output answering the question posed above.
样例输入
7
12
0
样例输出
6
4
来源
Waterloo local 2002.07.01
全局题号
1409
添加于
2016-05-29
提交次数
31
尝试人数
11
通过人数
8