import java.util.Scanner;

public class Main { 
	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		int firstAnt = 0;
		int lastAnt = 0;
		for(int i = 0;i<5;i++) {
			int tmp = Integer.parseInt(sc.nextLine());
			if(i == 0) {
				firstAnt = tmp;
			}else if(i == 4) {
				lastAnt = tmp;
			}
		}
		int allowedDistant = Integer.parseInt(sc.nextLine());
		String result = "";
		if((lastAnt - firstAnt) <= allowedDistant) {
			result = "Yay!"; 
		}else {
			result = ":(";
		}

		
		
		System.out.println(result);

		
		
		
	}
}
	
	
/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