import java.util.*;
public class Main {

	public static void main(String[] args) {
		Scanner stdIn = new Scanner(System.in);
		int a = stdIn.nextInt();
		int b = stdIn.nextInt();
		int c = stdIn.nextInt();
		int d = stdIn.nextInt();
		int e = stdIn.nextInt();
		int k = stdIn.nextInt();
		
		if(e-a > k) {
			System.out.println(":(");
		}else {
			System.out.println("Yay!");
		}
		
		
		
	}

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

	public static void main(String[] args) {
		Scanner stdIn = new Scanner(System.in);
		int a = stdIn.nextInt();
		int b = stdIn.nextInt();
		int c = stdIn.nextInt();
		int d = stdIn.nextInt();
		int e = stdIn.nextInt();
		int k = stdIn.nextInt();
		
		if(e-a > k) {
			System.out.println(":(");
		}else {
			System.out.println("Yay!");
		}
		
		
		
	}

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

} public class Main {

	public static void main(String[] args) {
		Scanner stdIn = new Scanner(System.in);
		int a = stdIn.nextInt();
		int b = stdIn.nextInt();
		int c = stdIn.nextInt();
		int d = stdIn.nextInt();
		int e = stdIn.nextInt();
		int k = stdIn.nextInt();
		
		if(e-a > k) {
			System.out.println(":(");
		}else {
			System.out.println("Yay!");
		}
		
		
		
	}

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

	public static void main(String[] args) {
		Scanner stdIn = new Scanner(System.in);
		int a = stdIn.nextInt();
		int b = stdIn.nextInt();
		int c = stdIn.nextInt();
		int d = stdIn.nextInt();
		int e = stdIn.nextInt();
		int k = stdIn.nextInt();
		
		if(e-a > k) {
			System.out.println(":(");
		}else {
			System.out.println("Yay!");
		}
		
		
		
	}

}
