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

    int[] a = new int[5];

    for (int i = 0; i < 5; i++) {
      a[i] = sc.nextInt();
    }
    
    int k = sc.nextInt();
    
    String result = ant(a, k);
      
    // 出力
    System.out.println(result);
  }
  
  private static String ant(int[] a, int k) {
    
    for (int i = 0; i < a.length - 1; i++) {
      for (int j = i + 1; j < a.length; j++) {
        if (a[j] - a[i] > k) {
          return ":(";
        }
      }
    }
    return "Yay!";
  }
} import java.util.*; util.* java public class Main {
  
  public static void main(String[] args){
    Scanner sc = new Scanner(System.in);

    int[] a = new int[5];

    for (int i = 0; i < 5; i++) {
      a[i] = sc.nextInt();
    }
    
    int k = sc.nextInt();
    
    String result = ant(a, k);
      
    // 出力
    System.out.println(result);
  }
  
  private static String ant(int[] a, int k) {
    
    for (int i = 0; i < a.length - 1; i++) {
      for (int j = i + 1; j < a.length; j++) {
        if (a[j] - a[i] > k) {
          return ":(";
        }
      }
    }
    return "Yay!";
  }
} Main public static void main(String[] args){
    Scanner sc = new Scanner(System.in);

    int[] a = new int[5];

    for (int i = 0; i < 5; i++) {
      a[i] = sc.nextInt();
    }
    
    int k = sc.nextInt();
    
    String result = ant(a, k);
      
    // 出力
    System.out.println(result);
  } main {
    Scanner sc = new Scanner(System.in);

    int[] a = new int[5];

    for (int i = 0; i < 5; i++) {
      a[i] = sc.nextInt();
    }
    
    int k = sc.nextInt();
    
    String result = ant(a, k);
      
    // 出力
    System.out.println(result);
  } Scanner sc = new Scanner(System.in); sc new Scanner(System.in) int[] a = new int[5]; a new int[5] 5 for (int i = 0; i < 5; i++) {
      a[i] = sc.nextInt();
    } int i = 0; int i = 0; i 0 i < 5 i 5 i++ i++ i {
      a[i] = sc.nextInt();
    } {
      a[i] = sc.nextInt();
    } a[i] = sc.nextInt() a[i] a i sc.nextInt() sc.nextInt sc int k = sc.nextInt(); k sc.nextInt() sc.nextInt sc String result = ant(a, k); result ant(a, k) ant a k System.out.println(result) System.out.println System.out System System.out result String[] args args private static String ant(int[] a, int k) {
    
    for (int i = 0; i < a.length - 1; i++) {
      for (int j = i + 1; j < a.length; j++) {
        if (a[j] - a[i] > k) {
          return ":(";
        }
      }
    }
    return "Yay!";
  } ant {
    
    for (int i = 0; i < a.length - 1; i++) {
      for (int j = i + 1; j < a.length; j++) {
        if (a[j] - a[i] > k) {
          return ":(";
        }
      }
    }
    return "Yay!";
  } for (int i = 0; i < a.length - 1; i++) {
      for (int j = i + 1; j < a.length; j++) {
        if (a[j] - a[i] > k) {
          return ":(";
        }
      }
    } int i = 0; int i = 0; i 0 i < a.length - 1 i a.length - 1 a.length a a.length 1 i++ i++ i {
      for (int j = i + 1; j < a.length; j++) {
        if (a[j] - a[i] > k) {
          return ":(";
        }
      }
    } {
      for (int j = i + 1; j < a.length; j++) {
        if (a[j] - a[i] > k) {
          return ":(";
        }
      }
    } for (int j = i + 1; j < a.length; j++) {
        if (a[j] - a[i] > k) {
          return ":(";
        }
      } int j = i + 1; int j = i + 1; j i + 1 i 1 j < a.length j a.length a a.length j++ j++ j {
        if (a[j] - a[i] > k) {
          return ":(";
        }
      } {
        if (a[j] - a[i] > k) {
          return ":(";
        }
      } if (a[j] - a[i] > k) {
          return ":(";
        } a[j] - a[i] > k a[j] - a[i] a[j] a j a[i] a i k {
          return ":(";
        } return ":("; ":(" return "Yay!"; "Yay!" int[] a a int k k public class Main {
  
  public static void main(String[] args){
    Scanner sc = new Scanner(System.in);

    int[] a = new int[5];

    for (int i = 0; i < 5; i++) {
      a[i] = sc.nextInt();
    }
    
    int k = sc.nextInt();
    
    String result = ant(a, k);
      
    // 出力
    System.out.println(result);
  }
  
  private static String ant(int[] a, int k) {
    
    for (int i = 0; i < a.length - 1; i++) {
      for (int j = i + 1; j < a.length; j++) {
        if (a[j] - a[i] > k) {
          return ":(";
        }
      }
    }
    return "Yay!";
  }
} public class Main {
  
  public static void main(String[] args){
    Scanner sc = new Scanner(System.in);

    int[] a = new int[5];

    for (int i = 0; i < 5; i++) {
      a[i] = sc.nextInt();
    }
    
    int k = sc.nextInt();
    
    String result = ant(a, k);
      
    // 出力
    System.out.println(result);
  }
  
  private static String ant(int[] a, int k) {
    
    for (int i = 0; i < a.length - 1; i++) {
      for (int j = i + 1; j < a.length; j++) {
        if (a[j] - a[i] > k) {
          return ":(";
        }
      }
    }
    return "Yay!";
  }
} Main
import java.util.*;
public class Main {
  
  public static void main(String[] args){
    Scanner sc = new Scanner(System.in);

    int[] a = new int[5];

    for (int i = 0; i < 5; i++) {
      a[i] = sc.nextInt();
    }
    
    int k = sc.nextInt();
    
    String result = ant(a, k);
      
    // 出力
    System.out.println(result);
  }
  
  private static String ant(int[] a, int k) {
    
    for (int i = 0; i < a.length - 1; i++) {
      for (int j = i + 1; j < a.length; j++) {
        if (a[j] - a[i] > k) {
          return ":(";
        }
      }
    }
    return "Yay!";
  }
}