#include <fstream>

using namespace std;

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

int a,n;

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

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

    return 0;
}