import java.util.*;

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

		int a[] = new int[5];
		for (int i = 0; i < 5; i++) {
			a[i] = sc.nextInt();
		}
		int k = sc.nextInt();

		int judge = 1;
		for (int i = 0; i < 4; i++) {
			for (int j = i+1; j < 5; j++) {
				if (a[j] - a[i] > k) {
					judge--;
				}
			}
		}

		if (judge == 1) {
			System.out.println("Yay!");
		} else {
			System.out.println(":(");
		}
	}
}
/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