#include <iostream>
#include <fstream>

using namespace std;

long long euclid(long long a, long long n, long long k)
{
    if((a * k) % n == 1)
        return k;
    return euclid(a, n, k+1);
}

int main()
{
    ifstream f("inversmodular.in");
    ofstream g("inversmodular.out");
    long long a, n;
    f >> a >> n;
    g << euclid(a, n, 0);

    return 0;
}