#include <iostream>
#include <cmath>
using namespace std;

int main()
{
    int a,b,k,n;
    cin >> a >> b;
    k=1;
    do {k+=1;} while ((a*b*k+1)!=(round(sqrt(a*b*k+1)))*(round(sqrt(a*b*k+1))));
    n=sqrt(a*b*k+1);
    cout << n;
    return 0;
}