import java.util.Scanner;

public class Main{

	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		int n = 5;
		int[] a = new int[n];
		for (int i = 0; i < n; i++) {
			a[i] = Integer.parseInt(sc.next());
		}
		int k = Integer.parseInt(sc.next());

		String ans = "Yay!";
		if (a[4] - a[0] > k)
			ans = ":(";
		System.out.println(ans);

	}

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

	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		int n = 5;
		int[] a = new int[n];
		for (int i = 0; i < n; i++) {
			a[i] = Integer.parseInt(sc.next());
		}
		int k = Integer.parseInt(sc.next());

		String ans = "Yay!";
		if (a[4] - a[0] > k)
			ans = ":(";
		System.out.println(ans);

	}

} Main public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		int n = 5;
		int[] a = new int[n];
		for (int i = 0; i < n; i++) {
			a[i] = Integer.parseInt(sc.next());
		}
		int k = Integer.parseInt(sc.next());

		String ans = "Yay!";
		if (a[4] - a[0] > k)
			ans = ":(";
		System.out.println(ans);

	} main {
		Scanner sc = new Scanner(System.in);
		int n = 5;
		int[] a = new int[n];
		for (int i = 0; i < n; i++) {
			a[i] = Integer.parseInt(sc.next());
		}
		int k = Integer.parseInt(sc.next());

		String ans = "Yay!";
		if (a[4] - a[0] > k)
			ans = ":(";
		System.out.println(ans);

	} Scanner sc = new Scanner(System.in); sc new Scanner(System.in) int n = 5; n 5 int[] a = new int[n]; a new int[n] n for (int i = 0; i < n; i++) {
			a[i] = Integer.parseInt(sc.next());
		} int i = 0; int i = 0; i 0 i < n i n i++ i++ i {
			a[i] = Integer.parseInt(sc.next());
		} {
			a[i] = Integer.parseInt(sc.next());
		} a[i] = Integer.parseInt(sc.next()) a[i] a i Integer.parseInt(sc.next()) Integer.parseInt Integer sc.next() sc.next sc int k = Integer.parseInt(sc.next()); k Integer.parseInt(sc.next()) Integer.parseInt Integer sc.next() sc.next sc String ans = "Yay!"; ans "Yay!" if (a[4] - a[0] > k)
			ans = ":("; a[4] - a[0] > k a[4] - a[0] a[4] a 4 a[0] a 0 k ans = ":(" ans ":(" System.out.println(ans) System.out.println System.out System System.out ans String[] args args public class Main{

	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		int n = 5;
		int[] a = new int[n];
		for (int i = 0; i < n; i++) {
			a[i] = Integer.parseInt(sc.next());
		}
		int k = Integer.parseInt(sc.next());

		String ans = "Yay!";
		if (a[4] - a[0] > k)
			ans = ":(";
		System.out.println(ans);

	}

} public class Main{

	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		int n = 5;
		int[] a = new int[n];
		for (int i = 0; i < n; i++) {
			a[i] = Integer.parseInt(sc.next());
		}
		int k = Integer.parseInt(sc.next());

		String ans = "Yay!";
		if (a[4] - a[0] > k)
			ans = ":(";
		System.out.println(ans);

	}

} Main
import java.util.Scanner;

public class Main{

	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		int n = 5;
		int[] a = new int[n];
		for (int i = 0; i < n; i++) {
			a[i] = Integer.parseInt(sc.next());
		}
		int k = Integer.parseInt(sc.next());

		String ans = "Yay!";
		if (a[4] - a[0] > k)
			ans = ":(";
		System.out.println(ans);

	}

}
