fcb030_tribeau.cpp

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

typedef long long ll;

int main() {
  vector<ll> v(3); ll d;
  cin >> v[0] >> v[1] >> v[2] >> d;
  sort(v.begin(), v.end());
  cout << (v[2] - v[0] <= d ? "Yes" : "No") << '\n';
}