Lang:G++
Edit123456789101112131415161718192021#include <iostream>using namespace std;long long k, n;int gcd(long long a, long long b){return b == 0 ? a : gcd(b, a % b);}int main(){cin >> n >> k;long long i, count = 0;for(i = 1; i < n; i++){if(gcd(n, i) == 1){count++;}if(count == k)break;}cout << i;return 0;}