#include <bits/stdc++.h>
using namespace std;
using ll=long long;
using vell=vector<long long>;
using vs=vector<string>;
int main(){
  ll N,res;
  cin>>N;
  res=0;
  for (ll i=1;i<=N;i++){
    res+=pow(i,(i-1)%3+1);
  }
  cout<<res<<endl;
  return 0;
}