import java.util.Scanner;

public class Main {
    public static void main(String... args) {
        // 入力
        Scanner sc = new Scanner(System.in);
        int[] x = new int[5];
        x[0] = sc.nextInt();
        x[1] = sc.nextInt();
        x[2] = sc.nextInt();
        x[3] = sc.nextInt();
        x[4] = sc.nextInt();
        int k = sc.nextInt();

        for (int i=0;i<5-1;i++) {
            for (int j=i+1;j<5;j++) {
                if (Math.abs(x[i]-x[j]) > 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) {
        // 入力
        Scanner sc = new Scanner(System.in);
        int[] x = new int[5];
        x[0] = sc.nextInt();
        x[1] = sc.nextInt();
        x[2] = sc.nextInt();
        x[3] = sc.nextInt();
        x[4] = sc.nextInt();
        int k = sc.nextInt();

        for (int i=0;i<5-1;i++) {
            for (int j=i+1;j<5;j++) {
                if (Math.abs(x[i]-x[j]) > k) {
                    System.out.println(":(");
                    return;
                }
            }
        }
        System.out.println("Yay!");
    }
} Main public static void main(String... args) {
        // 入力
        Scanner sc = new Scanner(System.in);
        int[] x = new int[5];
        x[0] = sc.nextInt();
        x[1] = sc.nextInt();
        x[2] = sc.nextInt();
        x[3] = sc.nextInt();
        x[4] = sc.nextInt();
        int k = sc.nextInt();

        for (int i=0;i<5-1;i++) {
            for (int j=i+1;j<5;j++) {
                if (Math.abs(x[i]-x[j]) > k) {
                    System.out.println(":(");
                    return;
                }
            }
        }
        System.out.println("Yay!");
    } main {
        // 入力
        Scanner sc = new Scanner(System.in);
        int[] x = new int[5];
        x[0] = sc.nextInt();
        x[1] = sc.nextInt();
        x[2] = sc.nextInt();
        x[3] = sc.nextInt();
        x[4] = sc.nextInt();
        int k = sc.nextInt();

        for (int i=0;i<5-1;i++) {
            for (int j=i+1;j<5;j++) {
                if (Math.abs(x[i]-x[j]) > k) {
                    System.out.println(":(");
                    return;
                }
            }
        }
        System.out.println("Yay!");
    } Scanner sc = new Scanner(System.in); sc new Scanner(System.in) int[] x = new int[5]; x new int[5] 5 x[0] = sc.nextInt() x[0] x 0 sc.nextInt() sc.nextInt sc x[1] = sc.nextInt() x[1] x 1 sc.nextInt() sc.nextInt sc x[2] = sc.nextInt() x[2] x 2 sc.nextInt() sc.nextInt sc x[3] = sc.nextInt() x[3] x 3 sc.nextInt() sc.nextInt sc x[4] = sc.nextInt() x[4] x 4 sc.nextInt() sc.nextInt sc int k = sc.nextInt(); k sc.nextInt() sc.nextInt sc for (int i=0;i<5-1;i++) {
            for (int j=i+1;j<5;j++) {
                if (Math.abs(x[i]-x[j]) > k) {
                    System.out.println(":(");
                    return;
                }
            }
        } int i=0; int i=0; i 0 i<5-1 i 5-1 5 1 i++ i++ i {
            for (int j=i+1;j<5;j++) {
                if (Math.abs(x[i]-x[j]) > k) {
                    System.out.println(":(");
                    return;
                }
            }
        } {
            for (int j=i+1;j<5;j++) {
                if (Math.abs(x[i]-x[j]) > k) {
                    System.out.println(":(");
                    return;
                }
            }
        } for (int j=i+1;j<5;j++) {
                if (Math.abs(x[i]-x[j]) > 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 (Math.abs(x[i]-x[j]) > k) {
                    System.out.println(":(");
                    return;
                }
            } {
                if (Math.abs(x[i]-x[j]) > k) {
                    System.out.println(":(");
                    return;
                }
            } if (Math.abs(x[i]-x[j]) > k) {
                    System.out.println(":(");
                    return;
                } Math.abs(x[i]-x[j]) > k Math.abs(x[i]-x[j]) Math.abs Math x[i]-x[j] x[i] x i x[j] x j 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) {
        // 入力
        Scanner sc = new Scanner(System.in);
        int[] x = new int[5];
        x[0] = sc.nextInt();
        x[1] = sc.nextInt();
        x[2] = sc.nextInt();
        x[3] = sc.nextInt();
        x[4] = sc.nextInt();
        int k = sc.nextInt();

        for (int i=0;i<5-1;i++) {
            for (int j=i+1;j<5;j++) {
                if (Math.abs(x[i]-x[j]) > k) {
                    System.out.println(":(");
                    return;
                }
            }
        }
        System.out.println("Yay!");
    }
} public class Main {
    public static void main(String... args) {
        // 入力
        Scanner sc = new Scanner(System.in);
        int[] x = new int[5];
        x[0] = sc.nextInt();
        x[1] = sc.nextInt();
        x[2] = sc.nextInt();
        x[3] = sc.nextInt();
        x[4] = sc.nextInt();
        int k = sc.nextInt();

        for (int i=0;i<5-1;i++) {
            for (int j=i+1;j<5;j++) {
                if (Math.abs(x[i]-x[j]) > k) {
                    System.out.println(":(");
                    return;
                }
            }
        }
        System.out.println("Yay!");
    }
} Main
import java.util.Scanner;

public class Main {
    public static void main(String... args) {
        // 入力
        Scanner sc = new Scanner(System.in);
        int[] x = new int[5];
        x[0] = sc.nextInt();
        x[1] = sc.nextInt();
        x[2] = sc.nextInt();
        x[3] = sc.nextInt();
        x[4] = sc.nextInt();
        int k = sc.nextInt();

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