#include <iostream>
#include <fstream>
using namespace std;

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

void EuclidExtins(int a, int b, int &d, int &x, int &y) {
    if (b == 0) {
        d = a, y = 0, x = 1;
    } else {
        int x0, y0;
        EuclidExtins(b, a%b, d, x0, y0);
        x = y0;
        y = x0 - (a/b)*y0;
    }
}

int inversMod(int A, int N) {
    int d, x, y;
    EuclidExtins(A, N, d, x, y);
    while (x < 0) x += N;
    return x;
}

int main()
{
    int A, N;
    f >> A >> N;
    g << inversMod(A, N);
    f.close();
    g.close();
    return 0;
}