#include <fstream>
using namespace std;

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

void euclid_extins(int a, int b, int d, int& x, int& y) {
    if (b == 0)
    {
        d = a;
        x = 1;
        y = 0;
        return;
    }
    int x_, y_, q = a / b;
    euclid_extins(b, a % b, d, x_, y_);
    x = y_;
    y = x_ - q * y_;
}

int main()
{
    int a, n;
    in >> a >> n;
    int x, y;
    euclid_extins(a, n, 1, x, y);
    if (x > 0)
        out << x % n;
    else
        out << n + x % n;
    return 0;
}