import java.util.Scanner;

public class Main {
	public static void main(String[] args) throws Exception {
		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 x[] = new int[10];

		x[0] = Math.abs(a-b);
		x[1] = Math.abs(a-c);
		x[2] = Math.abs(a-d);
		x[3] = Math.abs(a-e);
		x[4] = Math.abs(b-c);
		x[5] = Math.abs(b-d);
		x[6] = Math.abs(b-e);
		x[7] = Math.abs(c-d);
		x[8] = Math.abs(c-e);
		x[9] = Math.abs(d-e);

		for (int i = 0; i < x.length; i++) {
			if (x[i] > k) {
				System.out.println(":(");
				return;
			}
		}
		System.out.println("Yay!");
	}
} import java.util.Scanner; Scanner java.util public class Main {
	public static void main(String[] args) throws Exception {
		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 x[] = new int[10];

		x[0] = Math.abs(a-b);
		x[1] = Math.abs(a-c);
		x[2] = Math.abs(a-d);
		x[3] = Math.abs(a-e);
		x[4] = Math.abs(b-c);
		x[5] = Math.abs(b-d);
		x[6] = Math.abs(b-e);
		x[7] = Math.abs(c-d);
		x[8] = Math.abs(c-e);
		x[9] = Math.abs(d-e);

		for (int i = 0; i < x.length; i++) {
			if (x[i] > k) {
				System.out.println(":(");
				return;
			}
		}
		System.out.println("Yay!");
	}
} Main public static void main(String[] args) throws Exception {
		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 x[] = new int[10];

		x[0] = Math.abs(a-b);
		x[1] = Math.abs(a-c);
		x[2] = Math.abs(a-d);
		x[3] = Math.abs(a-e);
		x[4] = Math.abs(b-c);
		x[5] = Math.abs(b-d);
		x[6] = Math.abs(b-e);
		x[7] = Math.abs(c-d);
		x[8] = Math.abs(c-e);
		x[9] = Math.abs(d-e);

		for (int i = 0; i < x.length; i++) {
			if (x[i] > k) {
				System.out.println(":(");
				return;
			}
		}
		System.out.println("Yay!");
	} 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 x[] = new int[10];

		x[0] = Math.abs(a-b);
		x[1] = Math.abs(a-c);
		x[2] = Math.abs(a-d);
		x[3] = Math.abs(a-e);
		x[4] = Math.abs(b-c);
		x[5] = Math.abs(b-d);
		x[6] = Math.abs(b-e);
		x[7] = Math.abs(c-d);
		x[8] = Math.abs(c-e);
		x[9] = Math.abs(d-e);

		for (int i = 0; i < x.length; i++) {
			if (x[i] > k) {
				System.out.println(":(");
				return;
			}
		}
		System.out.println("Yay!");
	} 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 x[] = new int[10]; x new int[10] 10 x[0] = Math.abs(a-b) x[0] x 0 Math.abs(a-b) Math.abs Math a-b a b x[1] = Math.abs(a-c) x[1] x 1 Math.abs(a-c) Math.abs Math a-c a c x[2] = Math.abs(a-d) x[2] x 2 Math.abs(a-d) Math.abs Math a-d a d x[3] = Math.abs(a-e) x[3] x 3 Math.abs(a-e) Math.abs Math a-e a e x[4] = Math.abs(b-c) x[4] x 4 Math.abs(b-c) Math.abs Math b-c b c x[5] = Math.abs(b-d) x[5] x 5 Math.abs(b-d) Math.abs Math b-d b d x[6] = Math.abs(b-e) x[6] x 6 Math.abs(b-e) Math.abs Math b-e b e x[7] = Math.abs(c-d) x[7] x 7 Math.abs(c-d) Math.abs Math c-d c d x[8] = Math.abs(c-e) x[8] x 8 Math.abs(c-e) Math.abs Math c-e c e x[9] = Math.abs(d-e) x[9] x 9 Math.abs(d-e) Math.abs Math d-e d e for (int i = 0; i < x.length; i++) {
			if (x[i] > k) {
				System.out.println(":(");
				return;
			}
		} int i = 0; int i = 0; i 0 i < x.length i x.length x x.length i++ i++ i {
			if (x[i] > k) {
				System.out.println(":(");
				return;
			}
		} {
			if (x[i] > k) {
				System.out.println(":(");
				return;
			}
		} if (x[i] > k) {
				System.out.println(":(");
				return;
			} x[i] > k x[i] x i k {
				System.out.println(":(");
				return;
			} System.out.println(":(") System.out.println System.out System System.out ":(" return; System.out.println("Yay!") System.out.println System.out System System.out "Yay!" String[] args args public class Main {
	public static void main(String[] args) throws Exception {
		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 x[] = new int[10];

		x[0] = Math.abs(a-b);
		x[1] = Math.abs(a-c);
		x[2] = Math.abs(a-d);
		x[3] = Math.abs(a-e);
		x[4] = Math.abs(b-c);
		x[5] = Math.abs(b-d);
		x[6] = Math.abs(b-e);
		x[7] = Math.abs(c-d);
		x[8] = Math.abs(c-e);
		x[9] = Math.abs(d-e);

		for (int i = 0; i < x.length; i++) {
			if (x[i] > k) {
				System.out.println(":(");
				return;
			}
		}
		System.out.println("Yay!");
	}
} public class Main {
	public static void main(String[] args) throws Exception {
		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 x[] = new int[10];

		x[0] = Math.abs(a-b);
		x[1] = Math.abs(a-c);
		x[2] = Math.abs(a-d);
		x[3] = Math.abs(a-e);
		x[4] = Math.abs(b-c);
		x[5] = Math.abs(b-d);
		x[6] = Math.abs(b-e);
		x[7] = Math.abs(c-d);
		x[8] = Math.abs(c-e);
		x[9] = Math.abs(d-e);

		for (int i = 0; i < x.length; i++) {
			if (x[i] > k) {
				System.out.println(":(");
				return;
			}
		}
		System.out.println("Yay!");
	}
} Main
import java.util.Scanner;

public class Main {
	public static void main(String[] args) throws Exception {
		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 x[] = new int[10];

		x[0] = Math.abs(a-b);
		x[1] = Math.abs(a-c);
		x[2] = Math.abs(a-d);
		x[3] = Math.abs(a-e);
		x[4] = Math.abs(b-c);
		x[5] = Math.abs(b-d);
		x[6] = Math.abs(b-e);
		x[7] = Math.abs(c-d);
		x[8] = Math.abs(c-e);
		x[9] = Math.abs(d-e);

		for (int i = 0; i < x.length; i++) {
			if (x[i] > k) {
				System.out.println(":(");
				return;
			}
		}
		System.out.println("Yay!");
	}
}
