#include <fstream>
using namespace std;

ifstream f("inversmodular.in");
ofstream g("inversmodular.out");
void euclid(long long a, long long b, long long &d, long long &x, long long &y)
{
    if(b == 0)
    {
        d = a;
        x = 1;
        y = 0;
    }
    else
    {
        long long x1, y1;
        euclid(b, a % b, d, x1, y1);
        x = y1;
        y = x1 - 1LL * (a / b) * y1;
    }
}

int main()
{
    long long a, n;
    f >> a >> n;
    long long d, x, y;
    euclid(a, n, d, x, y);
    while(x < 0)
        x += n;
    g << x;
    return 0;
}