#include <fstream>

using namespace std;

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

long long a, n, x, y;

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

int main()
{
    f >> a >> n;
    euclid(a, n, x, y);
    x = x % n;
    if (x < 0)
        x += n;
    g << x;
    f.close();
    g.close();
    return 0;
}