import java.util.*;

class Main {
  public static void main(String[] args) {
    Scanner scanner = new Scanner(System.in);
    ArrayList<Integer> list = new ArrayList<>();
    for (int i = 0; i < 5; i++) {
      list.add(Integer.parseInt(scanner.nextLine()));
    }
    int k = Integer.parseInt(scanner.nextLine());
    for (int i = 0; i < list.size() - 1; i++) {
      for (int j = i + 1; j < list.size(); j++) {
        if ((list.get(i) < list.get(j) && (list.get(j) - list.get(i) > k)) || (list.get(i) - list.get(j) > k)) {
          System.out.println(":(");
          return;
        }
      }
    }
    System.out.println("Yay!");
  }
}
/tmp/hf-datasets-cache/medium/datasets/42704881117311-config-parquet-and-info-qiankunmu-Project_CodeNet-896c9d36/hub/datasets--qiankunmu--Project_CodeNet_Python800_and_Java250/snapshots/c899fde44a77ba1cc14973ed3de064e4ff3aadc7/Project_CodeNet_Java250.tar.gz