#include <bits/stdc++.h>

using namespace std;

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

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 a, n;
    fin >> a >> n;
    int x, y, d;
    d = Euclid(a, n, x, y);
    while (x < 0) x = x + n * 100;
    x = x % n;
    fout << x;
    fin.close();
    fout.close();
    return 0;
}