import java.util.Scanner;
import java.util.Arrays;

public class Main{

    public static void main(String[] args){
        Scanner scan = new Scanner(System.in);

        // input
        int[] antennas = new int[5];
        for(int i = 0; i < 5; i++){
            antennas[i] = scan.nextInt();
        }
        int k = scan.nextInt();

        // search
        String answer = "Yay!";
        for(int i = 0; i < 4; i++){
            for(int j = i + 1; j < 5; j++){
                if(antennas[j] - antennas[i] > k){
                    answer = ":(";
                }
            }
        }
        
        // answer
        System.out.println(answer);


    }
} import java.util.Scanner; Scanner java.util import java.util.Arrays; Arrays java.util public class Main{

    public static void main(String[] args){
        Scanner scan = new Scanner(System.in);

        // input
        int[] antennas = new int[5];
        for(int i = 0; i < 5; i++){
            antennas[i] = scan.nextInt();
        }
        int k = scan.nextInt();

        // search
        String answer = "Yay!";
        for(int i = 0; i < 4; i++){
            for(int j = i + 1; j < 5; j++){
                if(antennas[j] - antennas[i] > k){
                    answer = ":(";
                }
            }
        }
        
        // answer
        System.out.println(answer);


    }
} Main public static void main(String[] args){
        Scanner scan = new Scanner(System.in);

        // input
        int[] antennas = new int[5];
        for(int i = 0; i < 5; i++){
            antennas[i] = scan.nextInt();
        }
        int k = scan.nextInt();

        // search
        String answer = "Yay!";
        for(int i = 0; i < 4; i++){
            for(int j = i + 1; j < 5; j++){
                if(antennas[j] - antennas[i] > k){
                    answer = ":(";
                }
            }
        }
        
        // answer
        System.out.println(answer);


    } main {
        Scanner scan = new Scanner(System.in);

        // input
        int[] antennas = new int[5];
        for(int i = 0; i < 5; i++){
            antennas[i] = scan.nextInt();
        }
        int k = scan.nextInt();

        // search
        String answer = "Yay!";
        for(int i = 0; i < 4; i++){
            for(int j = i + 1; j < 5; j++){
                if(antennas[j] - antennas[i] > k){
                    answer = ":(";
                }
            }
        }
        
        // answer
        System.out.println(answer);


    } Scanner scan = new Scanner(System.in); scan new Scanner(System.in) int[] antennas = new int[5]; antennas new int[5] 5 for(int i = 0; i < 5; i++){
            antennas[i] = scan.nextInt();
        } int i = 0; int i = 0; i 0 i < 5 i 5 i++ i++ i {
            antennas[i] = scan.nextInt();
        } {
            antennas[i] = scan.nextInt();
        } antennas[i] = scan.nextInt() antennas[i] antennas i scan.nextInt() scan.nextInt scan int k = scan.nextInt(); k scan.nextInt() scan.nextInt scan String answer = "Yay!"; answer "Yay!" for(int i = 0; i < 4; i++){
            for(int j = i + 1; j < 5; j++){
                if(antennas[j] - antennas[i] > k){
                    answer = ":(";
                }
            }
        } int i = 0; int i = 0; i 0 i < 4 i 4 i++ i++ i {
            for(int j = i + 1; j < 5; j++){
                if(antennas[j] - antennas[i] > k){
                    answer = ":(";
                }
            }
        } {
            for(int j = i + 1; j < 5; j++){
                if(antennas[j] - antennas[i] > k){
                    answer = ":(";
                }
            }
        } for(int j = i + 1; j < 5; j++){
                if(antennas[j] - antennas[i] > k){
                    answer = ":(";
                }
            } int j = i + 1; int j = i + 1; j i + 1 i 1 j < 5 j 5 j++ j++ j {
                if(antennas[j] - antennas[i] > k){
                    answer = ":(";
                }
            } {
                if(antennas[j] - antennas[i] > k){
                    answer = ":(";
                }
            } if(antennas[j] - antennas[i] > k){
                    answer = ":(";
                } antennas[j] - antennas[i] > k antennas[j] - antennas[i] antennas[j] antennas j antennas[i] antennas i k {
                    answer = ":(";
                } answer = ":(" answer ":(" System.out.println(answer) System.out.println System.out System System.out answer String[] args args public class Main{

    public static void main(String[] args){
        Scanner scan = new Scanner(System.in);

        // input
        int[] antennas = new int[5];
        for(int i = 0; i < 5; i++){
            antennas[i] = scan.nextInt();
        }
        int k = scan.nextInt();

        // search
        String answer = "Yay!";
        for(int i = 0; i < 4; i++){
            for(int j = i + 1; j < 5; j++){
                if(antennas[j] - antennas[i] > k){
                    answer = ":(";
                }
            }
        }
        
        // answer
        System.out.println(answer);


    }
} public class Main{

    public static void main(String[] args){
        Scanner scan = new Scanner(System.in);

        // input
        int[] antennas = new int[5];
        for(int i = 0; i < 5; i++){
            antennas[i] = scan.nextInt();
        }
        int k = scan.nextInt();

        // search
        String answer = "Yay!";
        for(int i = 0; i < 4; i++){
            for(int j = i + 1; j < 5; j++){
                if(antennas[j] - antennas[i] > k){
                    answer = ":(";
                }
            }
        }
        
        // answer
        System.out.println(answer);


    }
} Main
import java.util.Scanner;
import java.util.Arrays;

public class Main{

    public static void main(String[] args){
        Scanner scan = new Scanner(System.in);

        // input
        int[] antennas = new int[5];
        for(int i = 0; i < 5; i++){
            antennas[i] = scan.nextInt();
        }
        int k = scan.nextInt();

        // search
        String answer = "Yay!";
        for(int i = 0; i < 4; i++){
            for(int j = i + 1; j < 5; j++){
                if(antennas[j] - antennas[i] > k){
                    answer = ":(";
                }
            }
        }
        
        // answer
        System.out.println(answer);


    }
}