#include <fstream>
using namespace std;
long long a,n,inv,ins;
void euclid(int a,int b,long long &x,long long&y)
{
    long long aux;
    if (b!=0)
         x=1,y=0;
     else
     {
         euclid(b,a%b,x,y);
         aux=x;
         x=y;
         y=aux-y*(a/b);
     }
}
int main()
{
    ifstream f("inversmodular.in");
    ofstream g("inversmodular.out");
    f>>a>>n;
    euclid(a,n,inv,ins);
    if (inv<=0)
       inv=n+inv%n;
    g<<inv<<'\n';
    f.close();
    g.close();
    return 0;
}