#include <bits/stdc++.h>
using namespace std;
using ll = long long;
using Graph = vector<vector<int>>;
long long GCD(long long a,long long b) {
  if(a%b == 0) return b;
  return GCD(b,a%b);
}
int main() {
  int N; cin >> N;
  int count = 0;
  for(int i = 0;i < N; i++) {
    for(int j = 0; j < N; j++) {
      if(N - (i + j) >= 0) {
        count++;
      }
    }
  }
  cout << count + 2<< endl;
}