#include <fstream>

using namespace std;

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

int n, m, x, y;

int euclid(int n, int m, int &x, int &y)
{
    if (m == 0)
    {
        x = 1;
        y = 0;
        return n;
    }
    else
    {
        int xx, yy;
        euclid(m, n % m, xx, yy);
        x = yy;
        y = xx - (n / m) * yy;
    }
}

int main()
{
    f >> n >> m;

    euclid(n, m, x, y);

    while (x < 0)
        x += m;

    g << x;
    return 0;
}