#include <fstream>

using namespace std;
ifstream fin("inversmodular.in");
ofstream fout("inversmodular.out");
long long A, N, X, Y;
void euclid(long long a, long long b, long long &x, long long &y)
{
    if(b)
    {
        euclid(b, a % b, x, y);
        long long x0, y0;
        x0 = x;
        y0 = y;
        x = y0;
        y = x0 - y0 * (a / b);
    }
    else
    {
        x = 1;
        y = 0;
    }
}
int main()
{
    fin>>A>>N;
    euclid(A, N, X, Y);
    while(X < 0)
    {
        X += N;
    }
    fout<<X<<'\n';
}