import java.util.Scanner;

public class Main {
	
	static int[] antena = new int[5];
	static int dist ;

	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		for(int i=0; i<5; i++) {
			antena[i] = Integer.parseInt(sc.nextLine());
		}
		dist = Integer.parseInt(sc.nextLine());
		
		int max = 0;
		
		for(int i=0; i<5; i++) {
			for(int j=4; j>i; j--) {
				if(Math.abs(antena[i] - antena[j]) > max) {
					max = Math.abs(antena[i] - antena[j]);
				}
			}
		}
		
		if(max > dist) {
			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