#include <bits/stdc++.h>
using namespace std;
int main() {
long long int n, m;
while (cin >> n >> m) {
if (m != 0) {
for (long long int i = 1; i < 2147483649; i++) {
n = n - m;
if (n == 1) {
cout << "Go Kevin!!\n";
break;
} else if (n < 0) {
cout << "No Stop!!\n";
break;
}
}
} else
cout << "Go Kevin!!\n";
}
return 0;
}