#include <iostream>
#include <fstream>

using namespace std;

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

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

    int x0, y0;
    euclid(b, a % b, x0, y0);
    x = y0;
    y = x0 - (a / b)*y0;
}

int main()
{
    int a,mod,x , y;
    f >> a >> mod;

    euclid(a , mod, x , y);

    if(x < 0)
        x = x % mod + mod;

    g << x;
    return 0;
}