import java.util.Scanner;

public class Main {

	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		int[] a = new int[6];
		for (int i = 0; i < 6; i++) {
			a[i] = sc.nextInt();
		}
		boolean s = true;
		for (int i = 0; i < 6; i++) {
			for (int j = i; j < 6; j++) {
				if (a[5] < Math.abs(a[i] - a[j])) {
					s = false;
					break;
				}
			}
		}
		System.out.println((s) ? "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