#include <bits/stdc++.h>
using namespace std;
int main() {
  int a, b, c, d, e, k;
  cin >> a >> b >> c >> d >> e >> e;
  if (e - a > k) {
    cout << ":(" << endl;
  } else {
    cout << "Yay!" << endl;
  }
  return 0;
}
