#include <iostream>
#include <fstream>

using namespace std;

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

int x, y, k, l;

void invers(int a, int b, int &k, int &l)
{
    if (b==0)
    {
        k=1;
        l=0;
        return;
    }
    int kp, lp;
    invers(b,a%b,kp,lp);
    k=lp;
    l=kp-lp*(a/b);
}

int main()
{
    f >> x >> y;
    invers(x,y,k,l);
    while (k<0)
    {
        k+=y;
    }
    g << k;
    return 0;
}