#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：________