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();    

	if(K>=b-a && K>=c-a && K>=d-a && K>=e-a && K>=c-b && K>=d-b && K>=e-b && K>=d-c && K>=e-c && K>=e-d){
		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();    

	if(K>=b-a && K>=c-a && K>=d-a && K>=e-a && K>=c-b && K>=d-b && K>=e-b && K>=d-c && K>=e-c && K>=e-d){
		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();    

	if(K>=b-a && K>=c-a && K>=d-a && K>=e-a && K>=c-b && K>=d-b && K>=e-b && K>=d-c && K>=e-c && K>=e-d){
		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();    

	if(K>=b-a && K>=c-a && K>=d-a && K>=e-a && K>=c-b && K>=d-b && K>=e-b && K>=d-c && K>=e-c && K>=e-d){
		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(K>=b-a && K>=c-a && K>=d-a && K>=e-a && K>=c-b && K>=d-b && K>=e-b && K>=d-c && K>=e-c && K>=e-d){
		System.out.println("Yay!");
	}else{
		System.out.println(":(");
	} K>=b-a && K>=c-a && K>=d-a && K>=e-a && K>=c-b && K>=d-b && K>=e-b && K>=d-c && K>=e-c && K>=e-d K>=e-c K>=d-c K>=e-b K>=d-b K>=c-b K>=e-a K>=d-a K>=b-a && K>=c-a && K>=d-a && K>=e-a && K>=c-b && K>=d-b && K>=e-b && K>=d-c && K>=e-c && K>=e-d K>=b-a K b-a b a K>=c-a K c-a c a K>=d-a K d-a d a K>=e-a K e-a e a K>=c-b K c-b c b K>=d-b K d-b d b K>=e-b K e-b e b K>=d-c K d-c d c K>=e-c K e-c e c K>=e-d K e-d e d {
		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();    

	if(K>=b-a && K>=c-a && K>=d-a && K>=e-a && K>=c-b && K>=d-b && K>=e-b && K>=d-c && K>=e-c && K>=e-d){
		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();    

	if(K>=b-a && K>=c-a && K>=d-a && K>=e-a && K>=c-b && K>=d-b && K>=e-b && K>=d-c && K>=e-c && K>=e-d){
		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();    

	if(K>=b-a && K>=c-a && K>=d-a && K>=e-a && K>=c-b && K>=d-b && K>=e-b && K>=d-c && K>=e-c && K>=e-d){
		System.out.println("Yay!");
	}else{
		System.out.println(":(");
	}
	}
}