#include <fstream>
#define ll long long

using namespace std;

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

ll m,n,inv,ins;

void fct(ll &x, ll &y, int a, int b)
{
     if (!b)
         x = 1, y = 0;
     else
     {
         fct(x, y, b, a % b);
         ll aux = x;
         x = y;
         y = aux - y * (a / b);
     }
}

int main()
{
    f>>m>>n;

     fct(inv,ins,m,n);

     if (inv <= 0)
       inv=n+inv%n;

    g<<inv;

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