
import java.util.Scanner;

public class Main {
	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);

		int a = sc.nextInt();
		int b = sc.nextInt();
		int c = sc.nextInt();
		int d = sc.nextInt();
		int e = sc.nextInt();
		int k = sc.nextInt();

		int[] antenas = {a,b,c,d,e};

		boolean connect = true;

		check : for(int i = 0; i< antenas.length-1; i++) {
			for(int j = i+1; j< antenas.length; j++) {
				if(antenas[j] - antenas[i] > k) {
					connect = false;
					break check;
				}
			}
		}

		String output = connect ? "Yay!" : ":(";

		System.out.println(output);
	}
}

/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