#include <bits/stdc++.h>
using namespace std;
template <class T = long long>
T in() {
  T x;
  cin >> x;
  return (x);
}
template <class T>
void print(T &x) {
  cout << x << "\n";
}
int main() {
  vector<int> a(5);
  for (int i = 0; i < (5); ++i) {
    cin >> a[i];
  }
  int k = in();
  if (a[4] - a[0] > k) {
    print(":(");
    return 0;
  }
  print("Yay!");
  return 0;
}
