#include <fstream>

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

void inv(long long a, long long b, long long& x, long long& y)
{
    if (!b)
        x = 1, y = 0;
    else
    {
        inv(b, a % b, x, y);
        long long aux = x;
        x = y;
        y = aux - y * (a / b);
    }
}
int main()
{
    long long a, mod, x, y;
    f >> a >> mod;
    inv(a, mod, x, y);
    while (x <= 0)
        x = mod + x % mod;
    g << x;
    f.close();
    g.close();
    return 0;
}