#include <fstream>
using namespace std;

int a, n;

void euclid(int a, int b, int &x, int &y) {
    if (b == 0)
        x = 1, y = 0;
    else {
        int x1, y1;
        euclid(b, a % b, x1, y1);
        x = y1;
        y = x1 - a / b * y1;
    }
}

int main() {
    int x, y;
    ifstream f("inversmodular.in");
    f >> a >> n;
    f.close();

    euclid(a, n, x, y);

    while (x < 0)
        x += n;

    ofstream g("inversmodular.out");
    g << x;
    g.close();

    return 0;
}