
import java.util.*;
import java.io.*;

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();
		
		boolean flag = false;
		if(k < Math.abs(a-b) ) flag = true;
		if(k < Math.abs(a-c) ) flag = true;
		if(k < Math.abs(a-d) ) flag = true;
		if(k < Math.abs(a-e) ) flag = true;
		if(k < Math.abs(b-c) ) flag = true;
		if(k < Math.abs(b-d) ) flag = true;
		if(k < Math.abs(b-e) ) flag = true;
		if(k < Math.abs(c-d) ) flag = true;
		if(k < Math.abs(c-e) ) flag = true;
		if(k < Math.abs(d-e) ) flag = true;
		
		if(flag==false) System.out.println("Yay!");
		else System.out.println(":(");
	}
} import java.util.*; util.* java import java.io.*; io.* java 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();
		
		boolean flag = false;
		if(k < Math.abs(a-b) ) flag = true;
		if(k < Math.abs(a-c) ) flag = true;
		if(k < Math.abs(a-d) ) flag = true;
		if(k < Math.abs(a-e) ) flag = true;
		if(k < Math.abs(b-c) ) flag = true;
		if(k < Math.abs(b-d) ) flag = true;
		if(k < Math.abs(b-e) ) flag = true;
		if(k < Math.abs(c-d) ) flag = true;
		if(k < Math.abs(c-e) ) flag = true;
		if(k < Math.abs(d-e) ) flag = true;
		
		if(flag==false) 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();
		
		boolean flag = false;
		if(k < Math.abs(a-b) ) flag = true;
		if(k < Math.abs(a-c) ) flag = true;
		if(k < Math.abs(a-d) ) flag = true;
		if(k < Math.abs(a-e) ) flag = true;
		if(k < Math.abs(b-c) ) flag = true;
		if(k < Math.abs(b-d) ) flag = true;
		if(k < Math.abs(b-e) ) flag = true;
		if(k < Math.abs(c-d) ) flag = true;
		if(k < Math.abs(c-e) ) flag = true;
		if(k < Math.abs(d-e) ) flag = true;
		
		if(flag==false) 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();
		
		boolean flag = false;
		if(k < Math.abs(a-b) ) flag = true;
		if(k < Math.abs(a-c) ) flag = true;
		if(k < Math.abs(a-d) ) flag = true;
		if(k < Math.abs(a-e) ) flag = true;
		if(k < Math.abs(b-c) ) flag = true;
		if(k < Math.abs(b-d) ) flag = true;
		if(k < Math.abs(b-e) ) flag = true;
		if(k < Math.abs(c-d) ) flag = true;
		if(k < Math.abs(c-e) ) flag = true;
		if(k < Math.abs(d-e) ) flag = true;
		
		if(flag==false) 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 boolean flag = false; flag false if(k < Math.abs(a-b) ) flag = true; k < Math.abs(a-b) k Math.abs(a-b) Math.abs Math a-b a b flag = true flag true if(k < Math.abs(a-c) ) flag = true; k < Math.abs(a-c) k Math.abs(a-c) Math.abs Math a-c a c flag = true flag true if(k < Math.abs(a-d) ) flag = true; k < Math.abs(a-d) k Math.abs(a-d) Math.abs Math a-d a d flag = true flag true if(k < Math.abs(a-e) ) flag = true; k < Math.abs(a-e) k Math.abs(a-e) Math.abs Math a-e a e flag = true flag true if(k < Math.abs(b-c) ) flag = true; k < Math.abs(b-c) k Math.abs(b-c) Math.abs Math b-c b c flag = true flag true if(k < Math.abs(b-d) ) flag = true; k < Math.abs(b-d) k Math.abs(b-d) Math.abs Math b-d b d flag = true flag true if(k < Math.abs(b-e) ) flag = true; k < Math.abs(b-e) k Math.abs(b-e) Math.abs Math b-e b e flag = true flag true if(k < Math.abs(c-d) ) flag = true; k < Math.abs(c-d) k Math.abs(c-d) Math.abs Math c-d c d flag = true flag true if(k < Math.abs(c-e) ) flag = true; k < Math.abs(c-e) k Math.abs(c-e) Math.abs Math c-e c e flag = true flag true if(k < Math.abs(d-e) ) flag = true; k < Math.abs(d-e) k Math.abs(d-e) Math.abs Math d-e d e flag = true flag true if(flag==false) System.out.println("Yay!");
		else System.out.println(":("); flag==false flag false 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) {

		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();
		
		boolean flag = false;
		if(k < Math.abs(a-b) ) flag = true;
		if(k < Math.abs(a-c) ) flag = true;
		if(k < Math.abs(a-d) ) flag = true;
		if(k < Math.abs(a-e) ) flag = true;
		if(k < Math.abs(b-c) ) flag = true;
		if(k < Math.abs(b-d) ) flag = true;
		if(k < Math.abs(b-e) ) flag = true;
		if(k < Math.abs(c-d) ) flag = true;
		if(k < Math.abs(c-e) ) flag = true;
		if(k < Math.abs(d-e) ) flag = true;
		
		if(flag==false) 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();
		
		boolean flag = false;
		if(k < Math.abs(a-b) ) flag = true;
		if(k < Math.abs(a-c) ) flag = true;
		if(k < Math.abs(a-d) ) flag = true;
		if(k < Math.abs(a-e) ) flag = true;
		if(k < Math.abs(b-c) ) flag = true;
		if(k < Math.abs(b-d) ) flag = true;
		if(k < Math.abs(b-e) ) flag = true;
		if(k < Math.abs(c-d) ) flag = true;
		if(k < Math.abs(c-e) ) flag = true;
		if(k < Math.abs(d-e) ) flag = true;
		
		if(flag==false) System.out.println("Yay!");
		else System.out.println(":(");
	}
} Main

import java.util.*;
import java.io.*;

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();
		
		boolean flag = false;
		if(k < Math.abs(a-b) ) flag = true;
		if(k < Math.abs(a-c) ) flag = true;
		if(k < Math.abs(a-d) ) flag = true;
		if(k < Math.abs(a-e) ) flag = true;
		if(k < Math.abs(b-c) ) flag = true;
		if(k < Math.abs(b-d) ) flag = true;
		if(k < Math.abs(b-e) ) flag = true;
		if(k < Math.abs(c-d) ) flag = true;
		if(k < Math.abs(c-e) ) flag = true;
		if(k < Math.abs(d-e) ) flag = true;
		
		if(flag==false) System.out.println("Yay!");
		else System.out.println(":(");
	}
}
