import java.util.*;

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

        int[] ant = new int[5];
        int k;
        boolean judge =true;
        int A = 0;

        for(int i = 0;i < ant.length;i++){
            ant[i] = sc.nextInt();
        }

        k = sc.nextInt();

        for(int i = 0;i < ant.length;i++){
            for(int j = i+1;j < ant.length;j++){
                A = ant[j] - ant[i];
                if(k < A)
                    judge = false;
            }
        }

        if(judge == false){
            System.out.println(":(");
        }else
            System.out.println("Yay!");

    }
} import java.util.*; util.* java class Main{
    public static void main(String[] args){
        Scanner sc = new Scanner(System.in);

        int[] ant = new int[5];
        int k;
        boolean judge =true;
        int A = 0;

        for(int i = 0;i < ant.length;i++){
            ant[i] = sc.nextInt();
        }

        k = sc.nextInt();

        for(int i = 0;i < ant.length;i++){
            for(int j = i+1;j < ant.length;j++){
                A = ant[j] - ant[i];
                if(k < A)
                    judge = false;
            }
        }

        if(judge == false){
            System.out.println(":(");
        }else
            System.out.println("Yay!");

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

        int[] ant = new int[5];
        int k;
        boolean judge =true;
        int A = 0;

        for(int i = 0;i < ant.length;i++){
            ant[i] = sc.nextInt();
        }

        k = sc.nextInt();

        for(int i = 0;i < ant.length;i++){
            for(int j = i+1;j < ant.length;j++){
                A = ant[j] - ant[i];
                if(k < A)
                    judge = false;
            }
        }

        if(judge == false){
            System.out.println(":(");
        }else
            System.out.println("Yay!");

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

        int[] ant = new int[5];
        int k;
        boolean judge =true;
        int A = 0;

        for(int i = 0;i < ant.length;i++){
            ant[i] = sc.nextInt();
        }

        k = sc.nextInt();

        for(int i = 0;i < ant.length;i++){
            for(int j = i+1;j < ant.length;j++){
                A = ant[j] - ant[i];
                if(k < A)
                    judge = false;
            }
        }

        if(judge == false){
            System.out.println(":(");
        }else
            System.out.println("Yay!");

    } Scanner sc = new Scanner(System.in); sc new Scanner(System.in) int[] ant = new int[5]; ant new int[5] 5 int k; k boolean judge =true; judge true int A = 0; A 0 for(int i = 0;i < ant.length;i++){
            ant[i] = sc.nextInt();
        } int i = 0; int i = 0; i 0 i < ant.length i ant.length ant ant.length i++ i++ i {
            ant[i] = sc.nextInt();
        } {
            ant[i] = sc.nextInt();
        } ant[i] = sc.nextInt() ant[i] ant i sc.nextInt() sc.nextInt sc k = sc.nextInt() k sc.nextInt() sc.nextInt sc for(int i = 0;i < ant.length;i++){
            for(int j = i+1;j < ant.length;j++){
                A = ant[j] - ant[i];
                if(k < A)
                    judge = false;
            }
        } int i = 0; int i = 0; i 0 i < ant.length i ant.length ant ant.length i++ i++ i {
            for(int j = i+1;j < ant.length;j++){
                A = ant[j] - ant[i];
                if(k < A)
                    judge = false;
            }
        } {
            for(int j = i+1;j < ant.length;j++){
                A = ant[j] - ant[i];
                if(k < A)
                    judge = false;
            }
        } for(int j = i+1;j < ant.length;j++){
                A = ant[j] - ant[i];
                if(k < A)
                    judge = false;
            } int j = i+1; int j = i+1; j i+1 i 1 j < ant.length j ant.length ant ant.length j++ j++ j {
                A = ant[j] - ant[i];
                if(k < A)
                    judge = false;
            } {
                A = ant[j] - ant[i];
                if(k < A)
                    judge = false;
            } A = ant[j] - ant[i] A ant[j] - ant[i] ant[j] ant j ant[i] ant i if(k < A)
                    judge = false; k < A k A judge = false judge false if(judge == false){
            System.out.println(":(");
        }else
            System.out.println("Yay!"); judge == false judge false {
            System.out.println(":(");
        } System.out.println(":(") System.out.println System.out System System.out ":(" System.out.println("Yay!") System.out.println System.out System System.out "Yay!" String[] args args
import java.util.*;

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

        int[] ant = new int[5];
        int k;
        boolean judge =true;
        int A = 0;

        for(int i = 0;i < ant.length;i++){
            ant[i] = sc.nextInt();
        }

        k = sc.nextInt();

        for(int i = 0;i < ant.length;i++){
            for(int j = i+1;j < ant.length;j++){
                A = ant[j] - ant[i];
                if(k < A)
                    judge = false;
            }
        }

        if(judge == false){
            System.out.println(":(");
        }else
            System.out.println("Yay!");

    }
}