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#include <iostream>
#include <fstream>
using namespace std;
long long find(long long P, long long Q){
long long counter = 0;
for(long long i = 1; i <= INT64_MAX; i++ )
{
if( i % P == 0){
counter += i/P;
if(counter == Q){
return i;
}
}
// if(A % i == 0)
// {
// tempB = tempB*i;
// if(tempB % A == 0)
// {
// return i;
// }
// }
}
return -1;
}
int main() {
long long P,Q;
ifstream in("gfact.in");
ofstream out("gfact.out");
in >> P >> Q;
out << find(P,Q);
return 0;
}