import java.util.Scanner;
import java.lang.Math;
class Main{
    public static void main(String[] arsg){
        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();
       int[] l = {a,b,c,d,e};
       String ans = "Yay!";
       out:
       for(int i = 0;i < l.length-1;i++){
           for(int x = 1;x < l.length;x++){
               if(Math.abs(l[i] - l[x]) > k){
                   ans = ":(";
                   break out;
               }
           }
       }
       System.out.println(ans);
    }
} import java.util.Scanner; Scanner java.util import java.lang.Math; Math java.lang class Main{
    public static void main(String[] arsg){
        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();
       int[] l = {a,b,c,d,e};
       String ans = "Yay!";
       out:
       for(int i = 0;i < l.length-1;i++){
           for(int x = 1;x < l.length;x++){
               if(Math.abs(l[i] - l[x]) > k){
                   ans = ":(";
                   break out;
               }
           }
       }
       System.out.println(ans);
    }
} Main public static void main(String[] arsg){
        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();
       int[] l = {a,b,c,d,e};
       String ans = "Yay!";
       out:
       for(int i = 0;i < l.length-1;i++){
           for(int x = 1;x < l.length;x++){
               if(Math.abs(l[i] - l[x]) > k){
                   ans = ":(";
                   break out;
               }
           }
       }
       System.out.println(ans);
    } 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();
       int[] l = {a,b,c,d,e};
       String ans = "Yay!";
       out:
       for(int i = 0;i < l.length-1;i++){
           for(int x = 1;x < l.length;x++){
               if(Math.abs(l[i] - l[x]) > k){
                   ans = ":(";
                   break out;
               }
           }
       }
       System.out.println(ans);
    } 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 int[] l = {a,b,c,d,e}; l {a,b,c,d,e} a b c d e String ans = "Yay!"; ans "Yay!" System.out.println(ans) System.out.println System.out System System.out ans String[] arsg arsg
import java.util.Scanner;
import java.lang.Math;
class Main{
    public static void main(String[] arsg){
        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();
       int[] l = {a,b,c,d,e};
       String ans = "Yay!";
       out:
       for(int i = 0;i < l.length-1;i++){
           for(int x = 1;x < l.length;x++){
               if(Math.abs(l[i] - l[x]) > k){
                   ans = ":(";
                   break out;
               }
           }
       }
       System.out.println(ans);
    }
}