import java.util.Scanner;

public class Main {

	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		int n = sc.nextInt();
		int m = sc.nextInt();
		int k = sc.nextInt();
		int l = sc.nextInt();
		int g = sc.nextInt();
		int p = sc.nextInt();
		long count=0;

		if(m-n>p ||k-n>p ||l-n>p ||g-n>p||k-m>p||l-m>p||g-m>p||l-k>p||g-k>p||g-l>p) {
			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