import java.util.Scanner;

public class Main {

	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		int n[]=new int[5];
		String s="Yay!";

		for(int i=0;i<=4;i++){



		n[i]= sc.nextInt();// nこの希望
		}
		int k=sc.nextInt();
		for(int i=0;i<=4;i++){
for(int j=0;j<=4;j++){
	if(Math.abs(n[i]-n[j])>k){
		s=":(";
	}
}
		}
System.out.println(s);

	}}
/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