#include <fstream>

using namespace std;

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

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