#include <iostream> using namespace std; int n, i, ans; int gcd(int a, int b) { if (a % b == 0) return b; else return gcd(b, a % b); } int main( ) { cin >> n; ans = 0; for (i = 1; i <= n; i++) if (gcd(n, i) == i) ans++; cout << ans << endl; }
输入:120
输出:____1____