#include <fstream>

using namespace std;
ifstream f("inversmodular.in");
ofstream g("inversmodular.out");
int A,N;
void c(long long &x,long long &y,int a, int b)
{ if(b==0) {x=1;y=0;}
  else{ c(x,y,b,a%b);
        long long aux=x;
        x=y;
        y=aux-y*a/b;
  }

}
int main()
{ long long x=0,y;
  f>>A>>N;
  c(x,y,A,N);
  if (x<=0) x=N+x%N;
   g<<x;
    return 0;
}