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