import java.util.*;

public class Main {
	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		int a = sc.nextInt();
		int e = sc.nextInt();
		int s = sc.nextInt();
		int d = sc.nextInt();
		int f = sc.nextInt();
		int k = sc.nextInt();
		sc.close();
		System.out.println(f-a>k ? ":(" : "Yay!");
	}
} import java.util.*; util.* java public class Main {
	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		int a = sc.nextInt();
		int e = sc.nextInt();
		int s = sc.nextInt();
		int d = sc.nextInt();
		int f = sc.nextInt();
		int k = sc.nextInt();
		sc.close();
		System.out.println(f-a>k ? ":(" : "Yay!");
	}
} Main public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		int a = sc.nextInt();
		int e = sc.nextInt();
		int s = sc.nextInt();
		int d = sc.nextInt();
		int f = sc.nextInt();
		int k = sc.nextInt();
		sc.close();
		System.out.println(f-a>k ? ":(" : "Yay!");
	} main {
		Scanner sc = new Scanner(System.in);
		int a = sc.nextInt();
		int e = sc.nextInt();
		int s = sc.nextInt();
		int d = sc.nextInt();
		int f = sc.nextInt();
		int k = sc.nextInt();
		sc.close();
		System.out.println(f-a>k ? ":(" : "Yay!");
	} Scanner sc = new Scanner(System.in); sc new Scanner(System.in) int a = sc.nextInt(); a sc.nextInt() sc.nextInt sc int e = sc.nextInt(); e sc.nextInt() sc.nextInt sc int s = sc.nextInt(); s sc.nextInt() sc.nextInt sc int d = sc.nextInt(); d sc.nextInt() sc.nextInt sc int f = sc.nextInt(); f sc.nextInt() sc.nextInt sc int k = sc.nextInt(); k sc.nextInt() sc.nextInt sc sc.close() sc.close sc System.out.println(f-a>k ? ":(" : "Yay!") System.out.println System.out System System.out f-a>k ? ":(" : "Yay!" f-a>k f-a f a k ":(" "Yay!" String[] args args public class Main {
	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		int a = sc.nextInt();
		int e = sc.nextInt();
		int s = sc.nextInt();
		int d = sc.nextInt();
		int f = sc.nextInt();
		int k = sc.nextInt();
		sc.close();
		System.out.println(f-a>k ? ":(" : "Yay!");
	}
} public class Main {
	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		int a = sc.nextInt();
		int e = sc.nextInt();
		int s = sc.nextInt();
		int d = sc.nextInt();
		int f = sc.nextInt();
		int k = sc.nextInt();
		sc.close();
		System.out.println(f-a>k ? ":(" : "Yay!");
	}
} Main
import java.util.*;

public class Main {
	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		int a = sc.nextInt();
		int e = sc.nextInt();
		int s = sc.nextInt();
		int d = sc.nextInt();
		int f = sc.nextInt();
		int k = sc.nextInt();
		sc.close();
		System.out.println(f-a>k ? ":(" : "Yay!");
	}
}