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 a = list.get(0);
    int e = list.get(4);
    int k = Integer.parseInt(scanner.nextLine());
    if (e -a > k) {
      System.out.println(":(");
    }
    else {
      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