import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.util.Scanner;

public class Main {

	public static void main(String[] args) {
		Scanner in = new Scanner(new BufferedReader(new InputStreamReader(System.in)));
		int a = in.nextInt();
		int b = in.nextInt();
		int c = in.nextInt();
		int d = in.nextInt();
		int e = in.nextInt();
		int k = in.nextInt();
		System.out.println(solve(a, e, k));
		in.close();
	}

	private static String solve(int a, int e, int k) {
		if (e - a > k)
			return ":(";
		else
			return "Yay!";
	}

} import java.io.BufferedReader; BufferedReader java.io import java.io.InputStreamReader; InputStreamReader java.io import java.util.Scanner; Scanner java.util public class Main {

	public static void main(String[] args) {
		Scanner in = new Scanner(new BufferedReader(new InputStreamReader(System.in)));
		int a = in.nextInt();
		int b = in.nextInt();
		int c = in.nextInt();
		int d = in.nextInt();
		int e = in.nextInt();
		int k = in.nextInt();
		System.out.println(solve(a, e, k));
		in.close();
	}

	private static String solve(int a, int e, int k) {
		if (e - a > k)
			return ":(";
		else
			return "Yay!";
	}

} Main public static void main(String[] args) {
		Scanner in = new Scanner(new BufferedReader(new InputStreamReader(System.in)));
		int a = in.nextInt();
		int b = in.nextInt();
		int c = in.nextInt();
		int d = in.nextInt();
		int e = in.nextInt();
		int k = in.nextInt();
		System.out.println(solve(a, e, k));
		in.close();
	} main {
		Scanner in = new Scanner(new BufferedReader(new InputStreamReader(System.in)));
		int a = in.nextInt();
		int b = in.nextInt();
		int c = in.nextInt();
		int d = in.nextInt();
		int e = in.nextInt();
		int k = in.nextInt();
		System.out.println(solve(a, e, k));
		in.close();
	} Scanner in = new Scanner(new BufferedReader(new InputStreamReader(System.in))); in new Scanner(new BufferedReader(new InputStreamReader(System.in))) int a = in.nextInt(); a in.nextInt() in.nextInt in int b = in.nextInt(); b in.nextInt() in.nextInt in int c = in.nextInt(); c in.nextInt() in.nextInt in int d = in.nextInt(); d in.nextInt() in.nextInt in int e = in.nextInt(); e in.nextInt() in.nextInt in int k = in.nextInt(); k in.nextInt() in.nextInt in System.out.println(solve(a, e, k)) System.out.println System.out System System.out solve(a, e, k) solve a e k in.close() in.close in String[] args args private static String solve(int a, int e, int k) {
		if (e - a > k)
			return ":(";
		else
			return "Yay!";
	} solve {
		if (e - a > k)
			return ":(";
		else
			return "Yay!";
	} if (e - a > k)
			return ":(";
		else
			return "Yay!"; e - a > k e - a e a k return ":("; ":(" return "Yay!"; "Yay!" int a a int e e int k k public class Main {

	public static void main(String[] args) {
		Scanner in = new Scanner(new BufferedReader(new InputStreamReader(System.in)));
		int a = in.nextInt();
		int b = in.nextInt();
		int c = in.nextInt();
		int d = in.nextInt();
		int e = in.nextInt();
		int k = in.nextInt();
		System.out.println(solve(a, e, k));
		in.close();
	}

	private static String solve(int a, int e, int k) {
		if (e - a > k)
			return ":(";
		else
			return "Yay!";
	}

} public class Main {

	public static void main(String[] args) {
		Scanner in = new Scanner(new BufferedReader(new InputStreamReader(System.in)));
		int a = in.nextInt();
		int b = in.nextInt();
		int c = in.nextInt();
		int d = in.nextInt();
		int e = in.nextInt();
		int k = in.nextInt();
		System.out.println(solve(a, e, k));
		in.close();
	}

	private static String solve(int a, int e, int k) {
		if (e - a > k)
			return ":(";
		else
			return "Yay!";
	}

} Main
import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.util.Scanner;

public class Main {

	public static void main(String[] args) {
		Scanner in = new Scanner(new BufferedReader(new InputStreamReader(System.in)));
		int a = in.nextInt();
		int b = in.nextInt();
		int c = in.nextInt();
		int d = in.nextInt();
		int e = in.nextInt();
		int k = in.nextInt();
		System.out.println(solve(a, e, k));
		in.close();
	}

	private static String solve(int a, int e, int k) {
		if (e - a > k)
			return ":(";
		else
			return "Yay!";
	}

}