#include <fstream>
using namespace std;
ifstream f("inversmodular.in");
ofstream g("inversmodular.out");
int euclid(int a, int b, int &x, int &y)
{
    int x1, y1, d;
    if(b==0)
    {
        x=1;
        y=0;
        return a;
    }
    d=euclid(b, a%b, x1, y1);
    x=y1;
    y=x1-(a/b)*y1;
}
int main()
{
    int A, N, d, x, y;
    f>>A>>N;
    d=euclid(A, N, x, y);
    if(x<0)
        while(x<0)
            x+=N;
    g<<x;
    return 0;
}