#include <fstream>
#include <cstdlib>

using namespace std;

inline void gcd(int a, int b, int& x, int& y, int& d)
{
    if(!b)
    {
        x=1;
        y=0;
        d=a;
    }
    else {
            int x0, y0;

            gcd(b, a%b, x0, y0, d);
            x=y0;
            y=x0 - (a/b)*y0;
         }
}
int main()
{
    int A, N, x, y, d;
    ifstream in("inversmodular.in");
    ofstream out("inversmodular.out");

    in>>A>>N;
    gcd(A, N, x, y, d);
    if(x < 0)
        x+=N;
    out<<x<<'\n';

    return EXIT_SUCCESS;
}