Relatives Time Limit:1000MS Memory Limit:65536KB 64bit IO Format:%I64d & %I64u Submit Status Practice POJ 2407 Appoint description:
Description
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.Input
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.Output
For each test case there should be single line of output answering the question posed above.Sample Input
7 12 0
Sample Output
6 4
題意:給一個數n,求出不大於n且與n互素的數的個數。
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