#include <fstream>

using namespace std;

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

int euclid(int a, int b, int &x, int &y)
{
    if (b==0)
    {
        x=1;
        y=0;
        return a;
    }
    else
    {
        int x0,y0,d;
        d=euclid(b,a%b,x0,y0);
        x=y0;
        y=x0-(a/b)*y0;
        return d;
    }
}

int a,n,x,y;

int main()
{
    f>>a>>n;
    euclid(a,n,x,y);
    while (x<=0) x+=n;
    g<<x;
    return 0;
}