#include <fstream.h>
#include <iostream.h>
#include <math.h>
int main()
{
   ifstream fin("prim.in");
   ofstream fout("prim.out");
   long long a,b,c=1,i,n=1;
  // cin>>a>>b;
   fin>>a>>b;
   for (i=1;i<=b;i++)
   {
    c=c*a;
    n=n+c;
   }
  // cout<<n%9901;
   fout<<n;
   return 0;
}