#include <fstream>
using namespace std;

ifstream is("inversmodular.in");
ofstream os("inversmodular.out");

int a, n;

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

int main()
{
    is >> a >> n;

    long long x = 0, y = 0;
    EuclidE(x, y, a, n);
    if(x <= 0)
        x = n + x%n;
    os << x;

    is.close();
    os.close();
    return 0;
}