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

int main() {
  int64_t n;
  cin >> n;
  int64_t ans = 0;
  for (int64_t i = 0; i <= n; i++) {
    for (int64_t j = 0; i + j <= n; j++) {
      if (n - i - j >= 0) ans++;
    }
  }
  cout << ans << '\n';
  return 0;
}