#include <fstream>

using namespace std;

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

int a, M, inv, ins;

void euclid_ext(int a, int b, int &x, int &y)
{
    if(!b)
        x = 1, y = 0;
    else
    {
        euclid_ext(b, a % b, x, y);
        int p = x; x = y;
        y = p - y * (a / b);
    }
}

int main()
{
    f >> a >> M;

    euclid_ext(a, M, inv, ins);
    if(inv <= 0)
        inv = M + inv % M;

    g << inv;
    return 0;
}