#include <fstream>

using namespace std;

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

int a, mod, x, y;

int euclid(int a, int b, int &x, int &y) {
    if (b == 0) {
        x = 1, y = 0;
        return a;
    }
    int xx, yy, d;
    d = euclid(b, a%b, xx, yy);
    x = yy;
    y = xx-(a/b)*yy;
    return d;
}

int main() {
    f >> a >> mod;
    euclid(a, mod, x, y);
    if (x < 0) x += mod;
    g << x;
    return 0;
}