#include <bits/stdc++.h>
using namespace std;

int main() {
  int N;
  cin >> N;
  int ans = 0;
  for (int i = 0; i <= N; i++) {
    for (int j = 0; i + j <= N; j++) {
      if (N - i - j >= 0) ans++;
    }
  }
  cout << ans << "\n";
}