import java.util.*;
import static java.lang.Math.abs;

public class Main {

    public static void main(String[] args) {

        Scanner scan = new Scanner(System.in);

        int[]antena = new int[5];
        for(int i = 0; i < 5; i++){
            antena[i]=  scan.nextInt();
        }

        int k = scan.nextInt();

        int k0 = 0;
        for(int i = 0; i < 5; i++){

            for(int j = i+1; j < 5; j++){
                k0 = antena[i] - antena[j];
                
                if(k < abs(k0)){
                    System.out.println(":(");
                    return;
                }
            }
        }

        System.out.println("Yay!");
    }
} import java.util.*; util.* java import static java.lang.Math.abs; import static java.lang.Math.abs; import static java.lang.Math.abs; public class Main {

    public static void main(String[] args) {

        Scanner scan = new Scanner(System.in);

        int[]antena = new int[5];
        for(int i = 0; i < 5; i++){
            antena[i]=  scan.nextInt();
        }

        int k = scan.nextInt();

        int k0 = 0;
        for(int i = 0; i < 5; i++){

            for(int j = i+1; j < 5; j++){
                k0 = antena[i] - antena[j];
                
                if(k < abs(k0)){
                    System.out.println(":(");
                    return;
                }
            }
        }

        System.out.println("Yay!");
    }
} Main public static void main(String[] args) {

        Scanner scan = new Scanner(System.in);

        int[]antena = new int[5];
        for(int i = 0; i < 5; i++){
            antena[i]=  scan.nextInt();
        }

        int k = scan.nextInt();

        int k0 = 0;
        for(int i = 0; i < 5; i++){

            for(int j = i+1; j < 5; j++){
                k0 = antena[i] - antena[j];
                
                if(k < abs(k0)){
                    System.out.println(":(");
                    return;
                }
            }
        }

        System.out.println("Yay!");
    } main {

        Scanner scan = new Scanner(System.in);

        int[]antena = new int[5];
        for(int i = 0; i < 5; i++){
            antena[i]=  scan.nextInt();
        }

        int k = scan.nextInt();

        int k0 = 0;
        for(int i = 0; i < 5; i++){

            for(int j = i+1; j < 5; j++){
                k0 = antena[i] - antena[j];
                
                if(k < abs(k0)){
                    System.out.println(":(");
                    return;
                }
            }
        }

        System.out.println("Yay!");
    } Scanner scan = new Scanner(System.in); scan new Scanner(System.in) int[]antena = new int[5]; antena new int[5] 5 for(int i = 0; i < 5; i++){
            antena[i]=  scan.nextInt();
        } int i = 0; int i = 0; i 0 i < 5 i 5 i++ i++ i {
            antena[i]=  scan.nextInt();
        } {
            antena[i]=  scan.nextInt();
        } antena[i]=  scan.nextInt() antena[i] antena i scan.nextInt() scan.nextInt scan int k = scan.nextInt(); k scan.nextInt() scan.nextInt scan int k0 = 0; k0 0 for(int i = 0; i < 5; i++){

            for(int j = i+1; j < 5; j++){
                k0 = antena[i] - antena[j];
                
                if(k < abs(k0)){
                    System.out.println(":(");
                    return;
                }
            }
        } int i = 0; int i = 0; i 0 i < 5 i 5 i++ i++ i {

            for(int j = i+1; j < 5; j++){
                k0 = antena[i] - antena[j];
                
                if(k < abs(k0)){
                    System.out.println(":(");
                    return;
                }
            }
        } {

            for(int j = i+1; j < 5; j++){
                k0 = antena[i] - antena[j];
                
                if(k < abs(k0)){
                    System.out.println(":(");
                    return;
                }
            }
        } for(int j = i+1; j < 5; j++){
                k0 = antena[i] - antena[j];
                
                if(k < abs(k0)){
                    System.out.println(":(");
                    return;
                }
            } int j = i+1; int j = i+1; j i+1 i 1 j < 5 j 5 j++ j++ j {
                k0 = antena[i] - antena[j];
                
                if(k < abs(k0)){
                    System.out.println(":(");
                    return;
                }
            } {
                k0 = antena[i] - antena[j];
                
                if(k < abs(k0)){
                    System.out.println(":(");
                    return;
                }
            } k0 = antena[i] - antena[j] k0 antena[i] - antena[j] antena[i] antena i antena[j] antena j if(k < abs(k0)){
                    System.out.println(":(");
                    return;
                } k < abs(k0) k abs(k0) abs k0 {
                    System.out.println(":(");
                    return;
                } System.out.println(":(") System.out.println System.out System System.out ":(" return; System.out.println("Yay!") System.out.println System.out System System.out "Yay!" String[] args args public class Main {

    public static void main(String[] args) {

        Scanner scan = new Scanner(System.in);

        int[]antena = new int[5];
        for(int i = 0; i < 5; i++){
            antena[i]=  scan.nextInt();
        }

        int k = scan.nextInt();

        int k0 = 0;
        for(int i = 0; i < 5; i++){

            for(int j = i+1; j < 5; j++){
                k0 = antena[i] - antena[j];
                
                if(k < abs(k0)){
                    System.out.println(":(");
                    return;
                }
            }
        }

        System.out.println("Yay!");
    }
} public class Main {

    public static void main(String[] args) {

        Scanner scan = new Scanner(System.in);

        int[]antena = new int[5];
        for(int i = 0; i < 5; i++){
            antena[i]=  scan.nextInt();
        }

        int k = scan.nextInt();

        int k0 = 0;
        for(int i = 0; i < 5; i++){

            for(int j = i+1; j < 5; j++){
                k0 = antena[i] - antena[j];
                
                if(k < abs(k0)){
                    System.out.println(":(");
                    return;
                }
            }
        }

        System.out.println("Yay!");
    }
} Main
import java.util.*;
import static java.lang.Math.abs;

public class Main {

    public static void main(String[] args) {

        Scanner scan = new Scanner(System.in);

        int[]antena = new int[5];
        for(int i = 0; i < 5; i++){
            antena[i]=  scan.nextInt();
        }

        int k = scan.nextInt();

        int k0 = 0;
        for(int i = 0; i < 5; i++){

            for(int j = i+1; j < 5; j++){
                k0 = antena[i] - antena[j];
                
                if(k < abs(k0)){
                    System.out.println(":(");
                    return;
                }
            }
        }

        System.out.println("Yay!");
    }
}