#include <bits/stdc++.h>
using namespace std;
template <typename Arg1>
void __f(const char* name, Arg1&& arg1) {
  cerr << name << " : " << arg1 << '\n';
}
template <typename Arg1, typename... Args>
void __f(const char* names, Arg1&& arg1, Args&&... args) {
  const char* comma = strchr(names + 1, ',');
  cerr.write(names, comma - names) << " : " << arg1 << " | ";
  __f(comma + 1, args...);
}
int inf = 0x3f3f3f3f;
long long infl = 0x3f3f3f3f3f3f3f3fLL;
long double infd = 1.0 / 0.0;
const long long MOD = 1e9 + 7;
const long double pi = 2 * acos(0.0);
int main() {
  ios::sync_with_stdio(0);
  cin.tie(0);
  ;
  long long a, b, c, l, x;
  cin >> a >> b >> c >> l;
  long long res = (l + 3) * (l + 2) * (l + 1) / 6;
  for (long long i = 0; i <= l; i++) {
    x = min(a + i - b - c, l - i);
    if (x >= 0) res -= (x + 2) * (x + 1) / 2;
    x = min(b + i - a - c, l - i);
    if (x >= 0) res -= (x + 2) * (x + 1) / 2;
    x = min(c + i - b - a, l - i);
    if (x >= 0) res -= (x + 2) * (x + 1) / 2;
  }
  cout << res;
  return 0;
}
