#include <fstream>

using namespace std;

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

int n, a;

void gcd(long long &x, long long &y, int a, int b){
    if(!b){
        x = 1, y = 0;
    }
    else{
        gcd(x, y, b, a % b);
        long long aux = x;
        x = y;
        y = aux - y * (a / b);
    }
}

int main()
{
    long long inv = 0, ins;
    in >> a >> n;
    gcd(inv, ins, a, n);
    if(inv <= 0){
        inv = n + inv % n;
    }
    out << inv;
    return 0;
}