#include <iostream>
#include <fstream>

using namespace std;

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

unsigned int A,N;
unsigned long long B1,B2;

int main()
{
    in>>A>>N;

    for(int i=1; i*N+1<=0xffffffffffffffff; i++)
    {
        B1=(unsigned long long)(i*N+1)/(unsigned long long)A;
        B2=(unsigned long long)(i*N+1)%(unsigned long long)A;

        if(B1<=A && B2==0)
        {
            out<<B1;
            return 0;
        }
    }

    return 0;
}