import java.util.Scanner;

public class Main {

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

		System.out.println(a[a.length-1] - a[0] <= k ? "Yay!" : ":(");
		
	}
} import java.util.Scanner; Scanner java.util public class Main {

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

		System.out.println(a[a.length-1] - a[0] <= k ? "Yay!" : ":(");
		
	}
} Main public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		
		int[] a = new int[5];
		
		for(int i = 0; i < 5; i++) a[i]=Integer.parseInt(sc.next());
		
		int k = Integer.parseInt(sc.next());

		System.out.println(a[a.length-1] - a[0] <= k ? "Yay!" : ":(");
		
	} main {
		Scanner sc = new Scanner(System.in);
		
		int[] a = new int[5];
		
		for(int i = 0; i < 5; i++) a[i]=Integer.parseInt(sc.next());
		
		int k = Integer.parseInt(sc.next());

		System.out.println(a[a.length-1] - a[0] <= k ? "Yay!" : ":(");
		
	} Scanner sc = new Scanner(System.in); sc new Scanner(System.in) int[] a = new int[5]; a new int[5] 5 for(int i = 0; i < 5; i++) a[i]=Integer.parseInt(sc.next()); int i = 0; int i = 0; i 0 i < 5 i 5 i++ i++ i 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 System.out.println(a[a.length-1] - a[0] <= k ? "Yay!" : ":(") System.out.println System.out System System.out a[a.length-1] - a[0] <= k ? "Yay!" : ":(" a[a.length-1] - a[0] <= k a[a.length-1] - a[0] a[a.length-1] a a.length-1 a.length a a.length 1 a[0] a 0 k "Yay!" ":(" String[] args args public class Main {

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

		System.out.println(a[a.length-1] - a[0] <= k ? "Yay!" : ":(");
		
	}
} public class Main {

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

		System.out.println(a[a.length-1] - a[0] <= k ? "Yay!" : ":(");
		
	}
} Main
import java.util.Scanner;

public class Main {

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

		System.out.println(a[a.length-1] - a[0] <= k ? "Yay!" : ":(");
		
	}
}
