#include <iostream>
#include <fstream>

using namespace std;

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

int A, N;

void euclid (int a, int b, long long &x, long long &y)
{
    if (b == 0)
    {
        x = 1;
        y = 0;
    }

    else

    {
        euclid (b, a % b, x, y);

        long long aux = x;

        x = y;
        y = aux - (a / b) * y;
    }
}

int main()
{
    long long inv = 0, ins;

    in >> A >> N;

    euclid (A, N, inv, ins);

    if (inv <= 0)
       inv = N + inv % N;

    out << inv;

    return 0;
}