import java.util.*;
import java.io.*;
import java.math.*;
public class Main{
    public static void main(String[] args){
		Scanner sc = new Scanner(System.in);
		PrintWriter ou = new PrintWriter(System.out);
		int[] a = new int[5];
		for(int i = 0 ; i < 5 ; i++) a[i] = Integer.parseInt(sc.next());
		int k = Integer.parseInt(sc.next());
		sc.close();
		Arrays.sort(a);
		if(k >= a[4] - a[0]) ou.println("Yay!");
		else ou.println(":(");
		ou.flush();
	}
} import java.util.*; util.* java import java.io.*; io.* java import java.math.*; math.* java public class Main{
    public static void main(String[] args){
		Scanner sc = new Scanner(System.in);
		PrintWriter ou = new PrintWriter(System.out);
		int[] a = new int[5];
		for(int i = 0 ; i < 5 ; i++) a[i] = Integer.parseInt(sc.next());
		int k = Integer.parseInt(sc.next());
		sc.close();
		Arrays.sort(a);
		if(k >= a[4] - a[0]) ou.println("Yay!");
		else ou.println(":(");
		ou.flush();
	}
} Main public static void main(String[] args){
		Scanner sc = new Scanner(System.in);
		PrintWriter ou = new PrintWriter(System.out);
		int[] a = new int[5];
		for(int i = 0 ; i < 5 ; i++) a[i] = Integer.parseInt(sc.next());
		int k = Integer.parseInt(sc.next());
		sc.close();
		Arrays.sort(a);
		if(k >= a[4] - a[0]) ou.println("Yay!");
		else ou.println(":(");
		ou.flush();
	} main {
		Scanner sc = new Scanner(System.in);
		PrintWriter ou = new PrintWriter(System.out);
		int[] a = new int[5];
		for(int i = 0 ; i < 5 ; i++) a[i] = Integer.parseInt(sc.next());
		int k = Integer.parseInt(sc.next());
		sc.close();
		Arrays.sort(a);
		if(k >= a[4] - a[0]) ou.println("Yay!");
		else ou.println(":(");
		ou.flush();
	} Scanner sc = new Scanner(System.in); sc new Scanner(System.in) PrintWriter ou = new PrintWriter(System.out); ou new PrintWriter(System.out) int[] a = new int[5]; a new int[5] 5 for(int i = 0 ; i < 5 ; i++) a[i] = Integer.parseInt(sc.next()); int i = 0 ; int i = 0 ; i 0 i < 5 i 5 i++ i++ i a[i] = Integer.parseInt(sc.next()); a[i] = Integer.parseInt(sc.next()) a[i] a i Integer.parseInt(sc.next()) Integer.parseInt Integer sc.next() sc.next sc int k = Integer.parseInt(sc.next()); k Integer.parseInt(sc.next()) Integer.parseInt Integer sc.next() sc.next sc sc.close() sc.close sc Arrays.sort(a) Arrays.sort Arrays a if(k >= a[4] - a[0]) ou.println("Yay!");
		else ou.println(":("); k >= a[4] - a[0] k a[4] - a[0] a[4] a 4 a[0] a 0 ou.println("Yay!") ou.println ou "Yay!" ou.println(":(") ou.println ou ":(" ou.flush() ou.flush ou String[] args args public class Main{
    public static void main(String[] args){
		Scanner sc = new Scanner(System.in);
		PrintWriter ou = new PrintWriter(System.out);
		int[] a = new int[5];
		for(int i = 0 ; i < 5 ; i++) a[i] = Integer.parseInt(sc.next());
		int k = Integer.parseInt(sc.next());
		sc.close();
		Arrays.sort(a);
		if(k >= a[4] - a[0]) ou.println("Yay!");
		else ou.println(":(");
		ou.flush();
	}
} public class Main{
    public static void main(String[] args){
		Scanner sc = new Scanner(System.in);
		PrintWriter ou = new PrintWriter(System.out);
		int[] a = new int[5];
		for(int i = 0 ; i < 5 ; i++) a[i] = Integer.parseInt(sc.next());
		int k = Integer.parseInt(sc.next());
		sc.close();
		Arrays.sort(a);
		if(k >= a[4] - a[0]) ou.println("Yay!");
		else ou.println(":(");
		ou.flush();
	}
} Main
import java.util.*;
import java.io.*;
import java.math.*;
public class Main{
    public static void main(String[] args){
		Scanner sc = new Scanner(System.in);
		PrintWriter ou = new PrintWriter(System.out);
		int[] a = new int[5];
		for(int i = 0 ; i < 5 ; i++) a[i] = Integer.parseInt(sc.next());
		int k = Integer.parseInt(sc.next());
		sc.close();
		Arrays.sort(a);
		if(k >= a[4] - a[0]) ou.println("Yay!");
		else ou.println(":(");
		ou.flush();
	}
}