import java.util.Scanner;

public class Main {
	public static void main(String[] args) {
		@SuppressWarnings("resource")
		Scanner sc = new Scanner(System.in);
		// 複数行の読み込み
		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 (e - a <= 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) {
		@SuppressWarnings("resource")
		Scanner sc = new Scanner(System.in);
		// 複数行の読み込み
		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 (e - a <= k) {
			System.out.println("Yay!");
		} else {
			System.out.println(":(");
		}

	}
} Main public static void main(String[] args) {
		@SuppressWarnings("resource")
		Scanner sc = new Scanner(System.in);
		// 複数行の読み込み
		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 (e - a <= k) {
			System.out.println("Yay!");
		} else {
			System.out.println(":(");
		}

	} main {
		@SuppressWarnings("resource")
		Scanner sc = new Scanner(System.in);
		// 複数行の読み込み
		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 (e - a <= k) {
			System.out.println("Yay!");
		} else {
			System.out.println(":(");
		}

	} @SuppressWarnings("resource")
		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 (e - a <= k) {
			System.out.println("Yay!");
		} else {
			System.out.println(":(");
		} e - a <= k e - a e a 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) {
		@SuppressWarnings("resource")
		Scanner sc = new Scanner(System.in);
		// 複数行の読み込み
		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 (e - a <= k) {
			System.out.println("Yay!");
		} else {
			System.out.println(":(");
		}

	}
} public class Main {
	public static void main(String[] args) {
		@SuppressWarnings("resource")
		Scanner sc = new Scanner(System.in);
		// 複数行の読み込み
		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 (e - a <= k) {
			System.out.println("Yay!");
		} else {
			System.out.println(":(");
		}

	}
} Main
import java.util.Scanner;

public class Main {
	public static void main(String[] args) {
		@SuppressWarnings("resource")
		Scanner sc = new Scanner(System.in);
		// 複数行の読み込み
		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 (e - a <= k) {
			System.out.println("Yay!");
		} else {
			System.out.println(":(");
		}

	}
}
