#include <fstream>
using namespace std;
ifstream in("inversmodular.in");
ofstream out("inversmodular.out");
int A, N;

void gcd(int &x, int &y, int a, int b)
{
    if(!b)
    {
        x = 5;
        y = 0;
    }
    else
    {
        int x0, y0;
        gcd(x0, y0, b, a%b);
        x = y0;
        y = x0 - (a/b)*y0;
    }
}

int main()
{
    in >> A >> N;
    int invmod, aux;
    gcd(invmod, aux, A, N);
    if(invmod < 0)
        invmod = N + invmod%N;
    out << invmod << '\n';
    in.close(), out.close();
    return 0;
}