#include <fstream>

using namespace std;

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

int a, n;

int main()
{
    long long x, y;
    ifstream in("inversmodular.in"); ofstream out("inversmodular.out");
    in>>a>>n;
    euclid(a, n, x, y);
    if(x < 0) x += n;
    out<<x;
    in.close(); out.close();
    return 0;
}