import java.util.Scanner;

public class Main {

	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		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 (K>=E-A) {
			System.out.println("Yay!");
		} else {
			System.out.println(":(");
		}
	}
} import java.util.Scanner; Scanner java.util public class Main {

	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		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 (K>=E-A) {
			System.out.println("Yay!");
		} else {
			System.out.println(":(");
		}
	}
} Main public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		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 (K>=E-A) {
			System.out.println("Yay!");
		} else {
			System.out.println(":(");
		}
	} main {
		Scanner sc = new Scanner(System.in);
		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 (K>=E-A) {
			System.out.println("Yay!");
		} else {
			System.out.println(":(");
		}
	} 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 (K>=E-A) {
			System.out.println("Yay!");
		} else {
			System.out.println(":(");
		} K>=E-A K E-A E A {
			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) {
		Scanner sc = new Scanner(System.in);
		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 (K>=E-A) {
			System.out.println("Yay!");
		} else {
			System.out.println(":(");
		}
	}
} public class Main {

	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		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 (K>=E-A) {
			System.out.println("Yay!");
		} else {
			System.out.println(":(");
		}
	}
} Main
import java.util.Scanner;

public class Main {

	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		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 (K>=E-A) {
			System.out.println("Yay!");
		} else {
			System.out.println(":(");
		}
	}
}
