#include <bits/stdc++.h>
using namespace std;
int main() {
  int n, a, b, c, d, num;
  while (cin >> n) {
    num = 0;
    int max = (n <= 1000) ? n : 1000;
    for (a = max; a >= 0; --a) {
      if (n - a <= 3000) {
        for (b = max; b >= 0; --b) {
          if (n - a - b <= 2000) {
            for (c = max; c >= 0; --c) {
              if (n - a - b - c <= 1000) {
                for (d = max; d >= 0; --d) {
                  if (a + b + c + d == n) ++num;
                }
              }
            }
          }
        }
      }
    }
    cout << num << endl;
  }
  return 0;
}
