import java.util.Scanner;

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();
		
		int max = Math.max(b-a, c-a);
		max = Math.max(max, d-a);
		max = Math.max(max, e-a);
		max = Math.max(max, c-b);
		max = Math.max(max, d-b);
		max = Math.max(max, e-b);
		max = Math.max(max, d-c);
		max = Math.max(max, e-c);
		max = Math.max(max, e-d);
		
		if (max<=k)
			System.out.println("Yay!");
		else
			
			System.out.println(":(");
	}

} import java.util.Scanner; Scanner 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();
		
		int max = Math.max(b-a, c-a);
		max = Math.max(max, d-a);
		max = Math.max(max, e-a);
		max = Math.max(max, c-b);
		max = Math.max(max, d-b);
		max = Math.max(max, e-b);
		max = Math.max(max, d-c);
		max = Math.max(max, e-c);
		max = Math.max(max, e-d);
		
		if (max<=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();
		
		int max = Math.max(b-a, c-a);
		max = Math.max(max, d-a);
		max = Math.max(max, e-a);
		max = Math.max(max, c-b);
		max = Math.max(max, d-b);
		max = Math.max(max, e-b);
		max = Math.max(max, d-c);
		max = Math.max(max, e-c);
		max = Math.max(max, e-d);
		
		if (max<=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();
		
		int max = Math.max(b-a, c-a);
		max = Math.max(max, d-a);
		max = Math.max(max, e-a);
		max = Math.max(max, c-b);
		max = Math.max(max, d-b);
		max = Math.max(max, e-b);
		max = Math.max(max, d-c);
		max = Math.max(max, e-c);
		max = Math.max(max, e-d);
		
		if (max<=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 int max = Math.max(b-a, c-a); max Math.max(b-a, c-a) Math.max Math b-a b a c-a c a max = Math.max(max, d-a) max Math.max(max, d-a) Math.max Math max d-a d a max = Math.max(max, e-a) max Math.max(max, e-a) Math.max Math max e-a e a max = Math.max(max, c-b) max Math.max(max, c-b) Math.max Math max c-b c b max = Math.max(max, d-b) max Math.max(max, d-b) Math.max Math max d-b d b max = Math.max(max, e-b) max Math.max(max, e-b) Math.max Math max e-b e b max = Math.max(max, d-c) max Math.max(max, d-c) Math.max Math max d-c d c max = Math.max(max, e-c) max Math.max(max, e-c) Math.max Math max e-c e c max = Math.max(max, e-d) max Math.max(max, e-d) Math.max Math max e-d e d if (max<=k)
			System.out.println("Yay!");
		else
			
			System.out.println(":("); max<=k max k System.out.println("Yay!") System.out.println System.out System System.out "Yay!" 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();
		
		int max = Math.max(b-a, c-a);
		max = Math.max(max, d-a);
		max = Math.max(max, e-a);
		max = Math.max(max, c-b);
		max = Math.max(max, d-b);
		max = Math.max(max, e-b);
		max = Math.max(max, d-c);
		max = Math.max(max, e-c);
		max = Math.max(max, e-d);
		
		if (max<=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();
		
		int max = Math.max(b-a, c-a);
		max = Math.max(max, d-a);
		max = Math.max(max, e-a);
		max = Math.max(max, c-b);
		max = Math.max(max, d-b);
		max = Math.max(max, e-b);
		max = Math.max(max, d-c);
		max = Math.max(max, e-c);
		max = Math.max(max, e-d);
		
		if (max<=k)
			System.out.println("Yay!");
		else
			
			System.out.println(":(");
	}

} Main
import java.util.Scanner;

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();
		
		int max = Math.max(b-a, c-a);
		max = Math.max(max, d-a);
		max = Math.max(max, e-a);
		max = Math.max(max, c-b);
		max = Math.max(max, d-b);
		max = Math.max(max, e-b);
		max = Math.max(max, d-c);
		max = Math.max(max, e-c);
		max = Math.max(max, e-d);
		
		if (max<=k)
			System.out.println("Yay!");
		else
			
			System.out.println(":(");
	}

}