#include <iostream>
#include <fstream>

using namespace std;

ifstream fin("inversmodular.in");
ofstream fout("inversmodular.out");

int main()
{
    long long a,n;
    fin >> a >> n;
    int p=0;
    bool ok=1;
    while(ok==1)
    {
        p++;
        long long prod=1LL*n*p+1;
        if(prod%a==0)
        {
            fout << prod/a;
            ok=0;
        }
    }
    return 0;
}