import java.util.Scanner;

public class Main {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        int[] p = new int[5];
        for(int i=0;i<5;i++){
            p[i] = Integer.parseInt(sc.next());
        }
        int k = Integer.parseInt(sc.next());
        sc.close();
        for(int i=0;i<5;i++){
            for(int j=i+1;j<5;j++){
                if(p[j]-p[i] > k){
                    System.out.println(":(");
                    return;
                }
            }
        }
        System.out.println("Yay!");

    }
    
} import java.util.Scanner; Scanner java.util public class Main {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        int[] p = new int[5];
        for(int i=0;i<5;i++){
            p[i] = Integer.parseInt(sc.next());
        }
        int k = Integer.parseInt(sc.next());
        sc.close();
        for(int i=0;i<5;i++){
            for(int j=i+1;j<5;j++){
                if(p[j]-p[i] > k){
                    System.out.println(":(");
                    return;
                }
            }
        }
        System.out.println("Yay!");

    }
    
} Main public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        int[] p = new int[5];
        for(int i=0;i<5;i++){
            p[i] = Integer.parseInt(sc.next());
        }
        int k = Integer.parseInt(sc.next());
        sc.close();
        for(int i=0;i<5;i++){
            for(int j=i+1;j<5;j++){
                if(p[j]-p[i] > k){
                    System.out.println(":(");
                    return;
                }
            }
        }
        System.out.println("Yay!");

    } main {
        Scanner sc = new Scanner(System.in);
        int[] p = new int[5];
        for(int i=0;i<5;i++){
            p[i] = Integer.parseInt(sc.next());
        }
        int k = Integer.parseInt(sc.next());
        sc.close();
        for(int i=0;i<5;i++){
            for(int j=i+1;j<5;j++){
                if(p[j]-p[i] > k){
                    System.out.println(":(");
                    return;
                }
            }
        }
        System.out.println("Yay!");

    } Scanner sc = new Scanner(System.in); sc new Scanner(System.in) int[] p = new int[5]; p new int[5] 5 for(int i=0;i<5;i++){
            p[i] = Integer.parseInt(sc.next());
        } int i=0; int i=0; i 0 i<5 i 5 i++ i++ i {
            p[i] = Integer.parseInt(sc.next());
        } {
            p[i] = Integer.parseInt(sc.next());
        } p[i] = Integer.parseInt(sc.next()) p[i] p 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 for(int i=0;i<5;i++){
            for(int j=i+1;j<5;j++){
                if(p[j]-p[i] > k){
                    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++){
                if(p[j]-p[i] > k){
                    System.out.println(":(");
                    return;
                }
            }
        } {
            for(int j=i+1;j<5;j++){
                if(p[j]-p[i] > k){
                    System.out.println(":(");
                    return;
                }
            }
        } for(int j=i+1;j<5;j++){
                if(p[j]-p[i] > k){
                    System.out.println(":(");
                    return;
                }
            } int j=i+1; int j=i+1; j i+1 i 1 j<5 j 5 j++ j++ j {
                if(p[j]-p[i] > k){
                    System.out.println(":(");
                    return;
                }
            } {
                if(p[j]-p[i] > k){
                    System.out.println(":(");
                    return;
                }
            } if(p[j]-p[i] > k){
                    System.out.println(":(");
                    return;
                } p[j]-p[i] > k p[j]-p[i] p[j] p j p[i] p i k {
                    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 sc = new Scanner(System.in);
        int[] p = new int[5];
        for(int i=0;i<5;i++){
            p[i] = Integer.parseInt(sc.next());
        }
        int k = Integer.parseInt(sc.next());
        sc.close();
        for(int i=0;i<5;i++){
            for(int j=i+1;j<5;j++){
                if(p[j]-p[i] > k){
                    System.out.println(":(");
                    return;
                }
            }
        }
        System.out.println("Yay!");

    }
    
} public class Main {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        int[] p = new int[5];
        for(int i=0;i<5;i++){
            p[i] = Integer.parseInt(sc.next());
        }
        int k = Integer.parseInt(sc.next());
        sc.close();
        for(int i=0;i<5;i++){
            for(int j=i+1;j<5;j++){
                if(p[j]-p[i] > k){
                    System.out.println(":(");
                    return;
                }
            }
        }
        System.out.println("Yay!");

    }
    
} Main
import java.util.Scanner;

public class Main {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        int[] p = new int[5];
        for(int i=0;i<5;i++){
            p[i] = Integer.parseInt(sc.next());
        }
        int k = Integer.parseInt(sc.next());
        sc.close();
        for(int i=0;i<5;i++){
            for(int j=i+1;j<5;j++){
                if(p[j]-p[i] > k){
                    System.out.println(":(");
                    return;
                }
            }
        }
        System.out.println("Yay!");

    }
    
}