import java.util.Scanner;

public class Main {
    public static void main(String[] args) {
        // シミュレーション
        Scanner sc = new Scanner(System.in);
        int[] antena = new int[6];
        for (int i = 0; i < 6; i++) {
            antena[i] = sc.nextInt();
        }

        int limit = antena[5];
        boolean isJumming = false;
        for (int i = 0; i < 6; i++) {
            for (int j = i + 1; j < 6; j++) {
                if ((antena[j] - antena[i]) > limit) {
                    isJumming = true;
                }
            }
        }

        System.out.println(isJumming ? ":(" : "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