#include <bits/stdc++.h>
using namespace std;
int main() {
  long long int n;
  while (cin >> n) {
    long long int ans = (n + 3) * (n + 2) * (n + 1) / 3 / 2 / 1;
    if (n > 1000) {
      ans -= (n - 1000 + 3) * (n - 1000 + 2) * (n - 1000 + 1) / 3 / 2 / 1 * 4;
    }
    cout << ans << endl;
  }
  return 0;
}
