import java.util.*;

public class Main {

	public static void main(String[] args) {
		
		Scanner sc = new Scanner(System.in);
		
		int a = sc.nextInt();
		int b = sc.nextInt();
		int c = sc.nextInt();
		int d = sc.nextInt();
		int e = sc.nextInt();
		int k = sc.nextInt();
		
		if (Math.abs(a - b) <= k && Math.abs(a-c) <= k && Math.abs(a-d) <= k && Math.abs(a-e) <=k
				&& Math.abs(b-c) <=k && Math.abs(b-d) <= k && Math.abs(b-e) <= k && Math.abs(c-d) <=k
				&& Math.abs(d-e) <= k) {
			System.out.println("Yay!");
		}else {
			System.out.println(":(");
		}
		
	}

} import java.util.*; util.* java public class Main {

	public static void main(String[] args) {
		
		Scanner sc = new Scanner(System.in);
		
		int a = sc.nextInt();
		int b = sc.nextInt();
		int c = sc.nextInt();
		int d = sc.nextInt();
		int e = sc.nextInt();
		int k = sc.nextInt();
		
		if (Math.abs(a - b) <= k && Math.abs(a-c) <= k && Math.abs(a-d) <= k && Math.abs(a-e) <=k
				&& Math.abs(b-c) <=k && Math.abs(b-d) <= k && Math.abs(b-e) <= k && Math.abs(c-d) <=k
				&& Math.abs(d-e) <= k) {
			System.out.println("Yay!");
		}else {
			System.out.println(":(");
		}
		
	}

} Main public static void main(String[] args) {
		
		Scanner sc = new Scanner(System.in);
		
		int a = sc.nextInt();
		int b = sc.nextInt();
		int c = sc.nextInt();
		int d = sc.nextInt();
		int e = sc.nextInt();
		int k = sc.nextInt();
		
		if (Math.abs(a - b) <= k && Math.abs(a-c) <= k && Math.abs(a-d) <= k && Math.abs(a-e) <=k
				&& Math.abs(b-c) <=k && Math.abs(b-d) <= k && Math.abs(b-e) <= k && Math.abs(c-d) <=k
				&& Math.abs(d-e) <= k) {
			System.out.println("Yay!");
		}else {
			System.out.println(":(");
		}
		
	} main {
		
		Scanner sc = new Scanner(System.in);
		
		int a = sc.nextInt();
		int b = sc.nextInt();
		int c = sc.nextInt();
		int d = sc.nextInt();
		int e = sc.nextInt();
		int k = sc.nextInt();
		
		if (Math.abs(a - b) <= k && Math.abs(a-c) <= k && Math.abs(a-d) <= k && Math.abs(a-e) <=k
				&& Math.abs(b-c) <=k && Math.abs(b-d) <= k && Math.abs(b-e) <= k && Math.abs(c-d) <=k
				&& Math.abs(d-e) <= k) {
			System.out.println("Yay!");
		}else {
			System.out.println(":(");
		}
		
	} Scanner sc = new Scanner(System.in); sc new Scanner(System.in) int a = sc.nextInt(); a sc.nextInt() sc.nextInt sc int b = sc.nextInt(); b sc.nextInt() sc.nextInt sc int c = sc.nextInt(); c sc.nextInt() sc.nextInt sc int d = sc.nextInt(); d sc.nextInt() sc.nextInt sc int e = sc.nextInt(); e sc.nextInt() sc.nextInt sc int k = sc.nextInt(); k sc.nextInt() sc.nextInt sc if (Math.abs(a - b) <= k && Math.abs(a-c) <= k && Math.abs(a-d) <= k && Math.abs(a-e) <=k
				&& Math.abs(b-c) <=k && Math.abs(b-d) <= k && Math.abs(b-e) <= k && Math.abs(c-d) <=k
				&& Math.abs(d-e) <= k) {
			System.out.println("Yay!");
		}else {
			System.out.println(":(");
		} Math.abs(a - b) <= k && Math.abs(a-c) <= k && Math.abs(a-d) <= k && Math.abs(a-e) <=k
				&& Math.abs(b-c) <=k && Math.abs(b-d) <= k && Math.abs(b-e) <= k && Math.abs(c-d) <=k
				&& Math.abs(d-e) <= k Math.abs(c-d) <=k Math.abs(b-e) <= k Math.abs(b-d) <= k Math.abs(b-c) <=k Math.abs(a-e) <=k Math.abs(a-d) <= k Math.abs(a - b) <= k && Math.abs(a-c) <= k && Math.abs(a-d) <= k && Math.abs(a-e) <=k
				&& Math.abs(b-c) <=k && Math.abs(b-d) <= k && Math.abs(b-e) <= k && Math.abs(c-d) <=k
				&& Math.abs(d-e) <= k Math.abs(a - b) <= k Math.abs(a - b) Math.abs Math a - b a b k Math.abs(a-c) <= k Math.abs(a-c) Math.abs Math a-c a c k Math.abs(a-d) <= k Math.abs(a-d) Math.abs Math a-d a d k Math.abs(a-e) <=k Math.abs(a-e) Math.abs Math a-e a e k Math.abs(b-c) <=k Math.abs(b-c) Math.abs Math b-c b c k Math.abs(b-d) <= k Math.abs(b-d) Math.abs Math b-d b d k Math.abs(b-e) <= k Math.abs(b-e) Math.abs Math b-e b e k Math.abs(c-d) <=k Math.abs(c-d) Math.abs Math c-d c d k Math.abs(d-e) <= k Math.abs(d-e) Math.abs Math d-e d e k {
			System.out.println("Yay!");
		} System.out.println("Yay!") System.out.println System.out System System.out "Yay!" {
			System.out.println(":(");
		} System.out.println(":(") System.out.println System.out System System.out ":(" String[] args args public class Main {

	public static void main(String[] args) {
		
		Scanner sc = new Scanner(System.in);
		
		int a = sc.nextInt();
		int b = sc.nextInt();
		int c = sc.nextInt();
		int d = sc.nextInt();
		int e = sc.nextInt();
		int k = sc.nextInt();
		
		if (Math.abs(a - b) <= k && Math.abs(a-c) <= k && Math.abs(a-d) <= k && Math.abs(a-e) <=k
				&& Math.abs(b-c) <=k && Math.abs(b-d) <= k && Math.abs(b-e) <= k && Math.abs(c-d) <=k
				&& Math.abs(d-e) <= k) {
			System.out.println("Yay!");
		}else {
			System.out.println(":(");
		}
		
	}

} public class Main {

	public static void main(String[] args) {
		
		Scanner sc = new Scanner(System.in);
		
		int a = sc.nextInt();
		int b = sc.nextInt();
		int c = sc.nextInt();
		int d = sc.nextInt();
		int e = sc.nextInt();
		int k = sc.nextInt();
		
		if (Math.abs(a - b) <= k && Math.abs(a-c) <= k && Math.abs(a-d) <= k && Math.abs(a-e) <=k
				&& Math.abs(b-c) <=k && Math.abs(b-d) <= k && Math.abs(b-e) <= k && Math.abs(c-d) <=k
				&& Math.abs(d-e) <= k) {
			System.out.println("Yay!");
		}else {
			System.out.println(":(");
		}
		
	}

} Main
import java.util.*;

public class Main {

	public static void main(String[] args) {
		
		Scanner sc = new Scanner(System.in);
		
		int a = sc.nextInt();
		int b = sc.nextInt();
		int c = sc.nextInt();
		int d = sc.nextInt();
		int e = sc.nextInt();
		int k = sc.nextInt();
		
		if (Math.abs(a - b) <= k && Math.abs(a-c) <= k && Math.abs(a-d) <= k && Math.abs(a-e) <=k
				&& Math.abs(b-c) <=k && Math.abs(b-d) <= k && Math.abs(b-e) <= k && Math.abs(c-d) <=k
				&& Math.abs(d-e) <= k) {
			System.out.println("Yay!");
		}else {
			System.out.println(":(");
		}
		
	}

}
