import java.util.Scanner;

class Main {

  public static void main(String[] args) {
    new Main().run();
  }

  private static Scanner sc = new Scanner(System.in);

  private void run() {
    int a = Integer.parseInt(sc.next());
    int b = Integer.parseInt(sc.next());
    int c = Integer.parseInt(sc.next());
    int d = Integer.parseInt(sc.next());
    int e = Integer.parseInt(sc.next());
    int k = Integer.parseInt(sc.next());

    if (b - a > k || c - a > k || d - a > k || e - a > k || c - b > k || d - b > k || e - b > k || d - c > k || e - c > k || e - d > k) {
      System.out.println(":(");
    } else {
      System.out.println("Yay!");
    }
  }
} import java.util.Scanner; Scanner java.util class Main {

  public static void main(String[] args) {
    new Main().run();
  }

  private static Scanner sc = new Scanner(System.in);

  private void run() {
    int a = Integer.parseInt(sc.next());
    int b = Integer.parseInt(sc.next());
    int c = Integer.parseInt(sc.next());
    int d = Integer.parseInt(sc.next());
    int e = Integer.parseInt(sc.next());
    int k = Integer.parseInt(sc.next());

    if (b - a > k || c - a > k || d - a > k || e - a > k || c - b > k || d - b > k || e - b > k || d - c > k || e - c > k || e - d > k) {
      System.out.println(":(");
    } else {
      System.out.println("Yay!");
    }
  }
} Main private static Scanner sc = new Scanner(System.in); sc new Scanner(System.in) public static void main(String[] args) {
    new Main().run();
  } main {
    new Main().run();
  } new Main().run() new Main().run new Main() String[] args args private void run() {
    int a = Integer.parseInt(sc.next());
    int b = Integer.parseInt(sc.next());
    int c = Integer.parseInt(sc.next());
    int d = Integer.parseInt(sc.next());
    int e = Integer.parseInt(sc.next());
    int k = Integer.parseInt(sc.next());

    if (b - a > k || c - a > k || d - a > k || e - a > k || c - b > k || d - b > k || e - b > k || d - c > k || e - c > k || e - d > k) {
      System.out.println(":(");
    } else {
      System.out.println("Yay!");
    }
  } run {
    int a = Integer.parseInt(sc.next());
    int b = Integer.parseInt(sc.next());
    int c = Integer.parseInt(sc.next());
    int d = Integer.parseInt(sc.next());
    int e = Integer.parseInt(sc.next());
    int k = Integer.parseInt(sc.next());

    if (b - a > k || c - a > k || d - a > k || e - a > k || c - b > k || d - b > k || e - b > k || d - c > k || e - c > k || e - d > k) {
      System.out.println(":(");
    } else {
      System.out.println("Yay!");
    }
  } int a = Integer.parseInt(sc.next()); a Integer.parseInt(sc.next()) Integer.parseInt Integer sc.next() sc.next sc int b = Integer.parseInt(sc.next()); b Integer.parseInt(sc.next()) Integer.parseInt Integer sc.next() sc.next sc int c = Integer.parseInt(sc.next()); c Integer.parseInt(sc.next()) Integer.parseInt Integer sc.next() sc.next sc int d = Integer.parseInt(sc.next()); d Integer.parseInt(sc.next()) Integer.parseInt Integer sc.next() sc.next sc int e = Integer.parseInt(sc.next()); e 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 if (b - a > k || c - a > k || d - a > k || e - a > k || c - b > k || d - b > k || e - b > k || d - c > k || e - c > k || e - d > k) {
      System.out.println(":(");
    } else {
      System.out.println("Yay!");
    } b - a > k || c - a > k || d - a > k || e - a > k || c - b > k || d - b > k || e - b > k || d - c > k || e - c > k || e - d > k e - c > k d - c > k e - b > k d - b > k c - b > k e - a > k d - a > k b - a > k || c - a > k || d - a > k || e - a > k || c - b > k || d - b > k || e - b > k || d - c > k || e - c > k || e - d > k b - a > k b - a b a k c - a > k c - a c a k d - a > k d - a d a k e - a > k e - a e a k c - b > k c - b c b k d - b > k d - b d b k e - b > k e - b e b k d - c > k d - c d c k e - c > k e - c e c k e - d > k e - d e d k {
      System.out.println(":(");
    } System.out.println(":(") System.out.println System.out System System.out ":(" {
      System.out.println("Yay!");
    } System.out.println("Yay!") System.out.println System.out System System.out "Yay!"
import java.util.Scanner;

class Main {

  public static void main(String[] args) {
    new Main().run();
  }

  private static Scanner sc = new Scanner(System.in);

  private void run() {
    int a = Integer.parseInt(sc.next());
    int b = Integer.parseInt(sc.next());
    int c = Integer.parseInt(sc.next());
    int d = Integer.parseInt(sc.next());
    int e = Integer.parseInt(sc.next());
    int k = Integer.parseInt(sc.next());

    if (b - a > k || c - a > k || d - a > k || e - a > k || c - b > k || d - b > k || e - b > k || d - c > k || e - c > k || e - d > k) {
      System.out.println(":(");
    } else {
      System.out.println("Yay!");
    }
  }
}
