#include <iostream>
#include <fstream>

using namespace std;

int a, n;

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

int main(int argc, const char * argv[]) {
    ifstream cin("inversmodular.in");
    ofstream cout("inversmodular.out");
    
    cin >> a >> n;
    
    int x, y;
    euclid(n, a, x, y);
    while (y < 0) {
        y += n;
    }
    cout << y;
    
    return 0;
}