#include <fstream>

using namespace std;

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

int n, k;

void euclid(int a, int b, int &x, int &y)
{
    if (b == 0)
    {
        x = 1, y = 0;
        return;
    }
    int xx = 0, yy = 0;
    euclid(b, a%b, xx, yy);
    x = yy;
    y = xx - (a/b)*yy;
}

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