#include <iostream>
using namespace std;

int main() {
long long n, m;
while ( cin >> n >> m ) {

if ( (0 == n && 0 == m) || (n != 1 && n == m) ) {
cout << "No Stop!!" << endl;
continue;
}
if ( 0 == m ) {
cout << "Go Kevin!!" << endl;
continue;
}

for ( int i = 1; n > 0; i += m )
n -= i;
cout << ( 0 == n ? "Go Kevin!!" : "No Stop!!" ) << endl;
}
return 0;
}