import java.util.Scanner;

class Main{

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

		}

		

	}


}


class Pair implements Comparable{
	int from;
	int end;
	@Override
	public int compareTo(Object other) {
		Pair otherpair = (Pair)other;

		return from - otherpair.from;
	}
}

 import java.util.Scanner; Scanner java.util class Main{

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

		}

		

	}


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

		}

		

	} main {
		Scanner sc = new Scanner(System.in);			//文字の入力
		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(E-A <= K){
			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(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("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 class Pair implements Comparable{
	int from;
	int end;
	@Override
	public int compareTo(Object other) {
		Pair otherpair = (Pair)other;

		return from - otherpair.from;
	}
} Pair int from; from int end; end @Override
	public int compareTo(Object other) {
		Pair otherpair = (Pair)other;

		return from - otherpair.from;
	} compareTo {
		Pair otherpair = (Pair)other;

		return from - otherpair.from;
	} Pair otherpair = (Pair)other; otherpair (Pair)other return from - otherpair.from; from - otherpair.from from otherpair.from otherpair otherpair.from Object other other Comparable
import java.util.Scanner;

class Main{

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

		}

		

	}


}


class Pair implements Comparable{
	int from;
	int end;
	@Override
	public int compareTo(Object other) {
		Pair otherpair = (Pair)other;

		return from - otherpair.from;
	}
}


