#include <fstream>
using namespace std;

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

int x0,y0;

void euclid_ext(int a,int b)
{
    if(b == 0)
    {
        x0 = 1;
        y0 = 0;
    }
    else
    {
        euclid_ext(b,a%b);
        int x = y0, y = x0 - a/b*y0;
        x0 = x , y0 = y;
    }
}

int main()
{
    int a,n;

    f>>a>>n;
    euclid_ext(a,n);

    while(x0 < 0) x0 += n;

    g<<x0<<"\n";

    f.close();
    g.close();
    return 0;
}