#include <bits/stdc++.h>
#include <atcoder/all>
using namespace std;
using namespace atcoder;
using ll = long long;
using ld = long double;

int main() {
  int N;
  cin >> N;
  int cnt = 0;
  for (int x = 0; x <= 3000; x++) {
    for (int y = 0; y <= 3000; y++) {
      int z = N - x - y;
      if (z >= 0) cnt++;
    }
  }
  cout << cnt << endl;
  return 0;
}