#include <fstream>

using namespace std;

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

int gcd_ext(int a, int b, int& x, int& y)
{
    if(b==0)
    {
        x=1;
        y=0;
        return a;
    }

    int x0, y0;
    int d=gcd_ext(b, a%b, x0, y0);

    x=y0;
    y=x0-(a/b)*y0;
    return d;
}

int main() {

    int a, n;

    in>>a>>n;
    int x, y;
    int d=gcd_ext(a, n, x, y);
    while(x<=0)
        x+=n;
    out<<x;

    return 0;
}