import java.util.Scanner;

public class Main {

	public static void main(String[] args) {
		int a = 0;
		int b = 0;
		int c = 0;
		int d = 0;
		int e = 0;
		int k = 0;
		Scanner sc = new Scanner(System.in);
		a = Integer.parseInt(sc.next());
		b = Integer.parseInt(sc.next());
		c = Integer.parseInt(sc.next());
		d = Integer.parseInt(sc.next());
		e = Integer.parseInt(sc.next());
		k = Integer.parseInt(sc.next());

		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) {
		int a = 0;
		int b = 0;
		int c = 0;
		int d = 0;
		int e = 0;
		int k = 0;
		Scanner sc = new Scanner(System.in);
		a = Integer.parseInt(sc.next());
		b = Integer.parseInt(sc.next());
		c = Integer.parseInt(sc.next());
		d = Integer.parseInt(sc.next());
		e = Integer.parseInt(sc.next());
		k = Integer.parseInt(sc.next());

		if (e - a <= k)
			System.out.println("Yay!");
		else
			System.out.println(":(");
	}
} Main public static void main(String[] args) {
		int a = 0;
		int b = 0;
		int c = 0;
		int d = 0;
		int e = 0;
		int k = 0;
		Scanner sc = new Scanner(System.in);
		a = Integer.parseInt(sc.next());
		b = Integer.parseInt(sc.next());
		c = Integer.parseInt(sc.next());
		d = Integer.parseInt(sc.next());
		e = Integer.parseInt(sc.next());
		k = Integer.parseInt(sc.next());

		if (e - a <= k)
			System.out.println("Yay!");
		else
			System.out.println(":(");
	} main {
		int a = 0;
		int b = 0;
		int c = 0;
		int d = 0;
		int e = 0;
		int k = 0;
		Scanner sc = new Scanner(System.in);
		a = Integer.parseInt(sc.next());
		b = Integer.parseInt(sc.next());
		c = Integer.parseInt(sc.next());
		d = Integer.parseInt(sc.next());
		e = Integer.parseInt(sc.next());
		k = Integer.parseInt(sc.next());

		if (e - a <= k)
			System.out.println("Yay!");
		else
			System.out.println(":(");
	} int a = 0; a 0 int b = 0; b 0 int c = 0; c 0 int d = 0; d 0 int e = 0; e 0 int k = 0; k 0 Scanner sc = new Scanner(System.in); sc new Scanner(System.in) a = Integer.parseInt(sc.next()) a Integer.parseInt(sc.next()) Integer.parseInt Integer sc.next() sc.next sc b = Integer.parseInt(sc.next()) b Integer.parseInt(sc.next()) Integer.parseInt Integer sc.next() sc.next sc c = Integer.parseInt(sc.next()) c Integer.parseInt(sc.next()) Integer.parseInt Integer sc.next() sc.next sc d = Integer.parseInt(sc.next()) d Integer.parseInt(sc.next()) Integer.parseInt Integer sc.next() sc.next sc e = Integer.parseInt(sc.next()) e Integer.parseInt(sc.next()) Integer.parseInt Integer sc.next() sc.next sc k = Integer.parseInt(sc.next()) k Integer.parseInt(sc.next()) Integer.parseInt Integer sc.next() sc.next 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 System.out System System.out "Yay!" System.out.println(":(") System.out.println System.out System System.out ":(" String[] args args public class Main {

	public static void main(String[] args) {
		int a = 0;
		int b = 0;
		int c = 0;
		int d = 0;
		int e = 0;
		int k = 0;
		Scanner sc = new Scanner(System.in);
		a = Integer.parseInt(sc.next());
		b = Integer.parseInt(sc.next());
		c = Integer.parseInt(sc.next());
		d = Integer.parseInt(sc.next());
		e = Integer.parseInt(sc.next());
		k = Integer.parseInt(sc.next());

		if (e - a <= k)
			System.out.println("Yay!");
		else
			System.out.println(":(");
	}
} public class Main {

	public static void main(String[] args) {
		int a = 0;
		int b = 0;
		int c = 0;
		int d = 0;
		int e = 0;
		int k = 0;
		Scanner sc = new Scanner(System.in);
		a = Integer.parseInt(sc.next());
		b = Integer.parseInt(sc.next());
		c = Integer.parseInt(sc.next());
		d = Integer.parseInt(sc.next());
		e = Integer.parseInt(sc.next());
		k = Integer.parseInt(sc.next());

		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) {
		int a = 0;
		int b = 0;
		int c = 0;
		int d = 0;
		int e = 0;
		int k = 0;
		Scanner sc = new Scanner(System.in);
		a = Integer.parseInt(sc.next());
		b = Integer.parseInt(sc.next());
		c = Integer.parseInt(sc.next());
		d = Integer.parseInt(sc.next());
		e = Integer.parseInt(sc.next());
		k = Integer.parseInt(sc.next());

		if (e - a <= k)
			System.out.println("Yay!");
		else
			System.out.println(":(");
	}
}