import java.util.Scanner;

public class Main {

    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        int min = Integer.MAX_VALUE;
        int max = Integer.MIN_VALUE;
        for (int i = 0; i < 5; i++) {
            int tmp = sc.nextInt();
            if (tmp < min) {
                min = tmp;
            }
            if (tmp > max) {
                max = tmp;
            }
        }
        int k = sc.nextInt();
        sc.close();

        if (max - min > 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