#include <fstream>
using namespace std;

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

int A, N;

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

    int x0, y0;

    gcd(b, a % b, x0, y0);

    x = y0;

    y = x0 - (a / b) * y0;
}

int main()
{
    f >> A >> N;

    int X, Y;

    gcd(A, N, X, Y);

    int inv = X % N;

    if (inv < 0)
    {
        inv += N;
    }

    g << inv << '\n';
}