import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.Scanner;

public class Main {

	public static void main(String[] args) {

		Map<Character, List<Integer>> charIndexMap = new HashMap<Character, List<Integer>>();
		Map<Integer, Integer> golemMap = new HashMap<Integer, Integer>();

		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 (e-a > k) {

			System.out.println(":(");
			return;
		}


		System.out.println("Yay!");
	}

} import java.util.HashMap; HashMap java.util import java.util.List; List java.util import java.util.Map; Map java.util import java.util.Scanner; Scanner java.util public class Main {

	public static void main(String[] args) {

		Map<Character, List<Integer>> charIndexMap = new HashMap<Character, List<Integer>>();
		Map<Integer, Integer> golemMap = new HashMap<Integer, Integer>();

		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 (e-a > k) {

			System.out.println(":(");
			return;
		}


		System.out.println("Yay!");
	}

} Main public static void main(String[] args) {

		Map<Character, List<Integer>> charIndexMap = new HashMap<Character, List<Integer>>();
		Map<Integer, Integer> golemMap = new HashMap<Integer, Integer>();

		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 (e-a > k) {

			System.out.println(":(");
			return;
		}


		System.out.println("Yay!");
	} main {

		Map<Character, List<Integer>> charIndexMap = new HashMap<Character, List<Integer>>();
		Map<Integer, Integer> golemMap = new HashMap<Integer, Integer>();

		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 (e-a > k) {

			System.out.println(":(");
			return;
		}


		System.out.println("Yay!");
	} Map<Character, List<Integer>> charIndexMap = new HashMap<Character, List<Integer>>(); charIndexMap new HashMap<Character, List<Integer>>() Map<Integer, Integer> golemMap = new HashMap<Integer, Integer>(); golemMap new HashMap<Integer, Integer>() 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(":(");
			return;
		} e-a > k e-a e a k {

			System.out.println(":(");
			return;
		} System.out.println(":(") System.out.println System.out System System.out ":(" return; System.out.println("Yay!") System.out.println System.out System System.out "Yay!" String[] args args public class Main {

	public static void main(String[] args) {

		Map<Character, List<Integer>> charIndexMap = new HashMap<Character, List<Integer>>();
		Map<Integer, Integer> golemMap = new HashMap<Integer, Integer>();

		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 (e-a > k) {

			System.out.println(":(");
			return;
		}


		System.out.println("Yay!");
	}

} public class Main {

	public static void main(String[] args) {

		Map<Character, List<Integer>> charIndexMap = new HashMap<Character, List<Integer>>();
		Map<Integer, Integer> golemMap = new HashMap<Integer, Integer>();

		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 (e-a > k) {

			System.out.println(":(");
			return;
		}


		System.out.println("Yay!");
	}

} Main
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.Scanner;

public class Main {

	public static void main(String[] args) {

		Map<Character, List<Integer>> charIndexMap = new HashMap<Character, List<Integer>>();
		Map<Integer, Integer> golemMap = new HashMap<Integer, Integer>();

		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 (e-a > k) {

			System.out.println(":(");
			return;
		}


		System.out.println("Yay!");
	}

}