
import java.util.Scanner;
import java.util.TreeSet;

public class Main {

	public static void main(String[] args) {
		// TODO Auto-generated method stub
		Scanner scn=new Scanner(System.in);
		TreeSet<Integer> tset=new TreeSet<>();
		tset.add(scn.nextInt());
		tset.add(scn.nextInt());
		tset.add(scn.nextInt());
		tset.add(scn.nextInt());
		tset.add(scn.nextInt());

		int k=scn.nextInt();
		int first=tset.first();
		if(tset.ceiling(first+k+1)!=null) {
			System.out.println(":(");
		}else {
			System.out.println("Yay!");
		}
	}

} import java.util.Scanner; Scanner java.util import java.util.TreeSet; TreeSet java.util public class Main {

	public static void main(String[] args) {
		// TODO Auto-generated method stub
		Scanner scn=new Scanner(System.in);
		TreeSet<Integer> tset=new TreeSet<>();
		tset.add(scn.nextInt());
		tset.add(scn.nextInt());
		tset.add(scn.nextInt());
		tset.add(scn.nextInt());
		tset.add(scn.nextInt());

		int k=scn.nextInt();
		int first=tset.first();
		if(tset.ceiling(first+k+1)!=null) {
			System.out.println(":(");
		}else {
			System.out.println("Yay!");
		}
	}

} Main public static void main(String[] args) {
		// TODO Auto-generated method stub
		Scanner scn=new Scanner(System.in);
		TreeSet<Integer> tset=new TreeSet<>();
		tset.add(scn.nextInt());
		tset.add(scn.nextInt());
		tset.add(scn.nextInt());
		tset.add(scn.nextInt());
		tset.add(scn.nextInt());

		int k=scn.nextInt();
		int first=tset.first();
		if(tset.ceiling(first+k+1)!=null) {
			System.out.println(":(");
		}else {
			System.out.println("Yay!");
		}
	} main {
		// TODO Auto-generated method stub
		Scanner scn=new Scanner(System.in);
		TreeSet<Integer> tset=new TreeSet<>();
		tset.add(scn.nextInt());
		tset.add(scn.nextInt());
		tset.add(scn.nextInt());
		tset.add(scn.nextInt());
		tset.add(scn.nextInt());

		int k=scn.nextInt();
		int first=tset.first();
		if(tset.ceiling(first+k+1)!=null) {
			System.out.println(":(");
		}else {
			System.out.println("Yay!");
		}
	} Scanner scn=new Scanner(System.in); scn new Scanner(System.in) TreeSet<Integer> tset=new TreeSet<>(); tset new TreeSet<>() tset.add(scn.nextInt()) tset.add tset scn.nextInt() scn.nextInt scn tset.add(scn.nextInt()) tset.add tset scn.nextInt() scn.nextInt scn tset.add(scn.nextInt()) tset.add tset scn.nextInt() scn.nextInt scn tset.add(scn.nextInt()) tset.add tset scn.nextInt() scn.nextInt scn tset.add(scn.nextInt()) tset.add tset scn.nextInt() scn.nextInt scn int k=scn.nextInt(); k scn.nextInt() scn.nextInt scn int first=tset.first(); first tset.first() tset.first tset if(tset.ceiling(first+k+1)!=null) {
			System.out.println(":(");
		}else {
			System.out.println("Yay!");
		} tset.ceiling(first+k+1)!=null tset.ceiling(first+k+1) tset.ceiling tset first+k+1 first+k+1 first k 1 null {
			System.out.println(":(");
		} System.out.println(":(") System.out.println System.out System System.out ":(" {
			System.out.println("Yay!");
		} 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) {
		// TODO Auto-generated method stub
		Scanner scn=new Scanner(System.in);
		TreeSet<Integer> tset=new TreeSet<>();
		tset.add(scn.nextInt());
		tset.add(scn.nextInt());
		tset.add(scn.nextInt());
		tset.add(scn.nextInt());
		tset.add(scn.nextInt());

		int k=scn.nextInt();
		int first=tset.first();
		if(tset.ceiling(first+k+1)!=null) {
			System.out.println(":(");
		}else {
			System.out.println("Yay!");
		}
	}

} public class Main {

	public static void main(String[] args) {
		// TODO Auto-generated method stub
		Scanner scn=new Scanner(System.in);
		TreeSet<Integer> tset=new TreeSet<>();
		tset.add(scn.nextInt());
		tset.add(scn.nextInt());
		tset.add(scn.nextInt());
		tset.add(scn.nextInt());
		tset.add(scn.nextInt());

		int k=scn.nextInt();
		int first=tset.first();
		if(tset.ceiling(first+k+1)!=null) {
			System.out.println(":(");
		}else {
			System.out.println("Yay!");
		}
	}

} Main

import java.util.Scanner;
import java.util.TreeSet;

public class Main {

	public static void main(String[] args) {
		// TODO Auto-generated method stub
		Scanner scn=new Scanner(System.in);
		TreeSet<Integer> tset=new TreeSet<>();
		tset.add(scn.nextInt());
		tset.add(scn.nextInt());
		tset.add(scn.nextInt());
		tset.add(scn.nextInt());
		tset.add(scn.nextInt());

		int k=scn.nextInt();
		int first=tset.first();
		if(tset.ceiling(first+k+1)!=null) {
			System.out.println(":(");
		}else {
			System.out.println("Yay!");
		}
	}

}
