import java.util.*;
 
public class Main{
  public static void main(String[] args){
    Scanner sc = new Scanner(System.in);
    int a = sc.nextInt(),
        b = sc.nextInt(),
        c = sc.nextInt(),
        d = sc.nextInt(),
        e = sc.nextInt(),
        k = sc.nextInt();
    String res = "Yay!";    
    if (e - a > k){
        res = ":(";
    }
    System.out.println(res);

  }
} import java.util.*; util.* java public class Main{
  public static void main(String[] args){
    Scanner sc = new Scanner(System.in);
    int a = sc.nextInt(),
        b = sc.nextInt(),
        c = sc.nextInt(),
        d = sc.nextInt(),
        e = sc.nextInt(),
        k = sc.nextInt();
    String res = "Yay!";    
    if (e - a > k){
        res = ":(";
    }
    System.out.println(res);

  }
} Main public static void main(String[] args){
    Scanner sc = new Scanner(System.in);
    int a = sc.nextInt(),
        b = sc.nextInt(),
        c = sc.nextInt(),
        d = sc.nextInt(),
        e = sc.nextInt(),
        k = sc.nextInt();
    String res = "Yay!";    
    if (e - a > k){
        res = ":(";
    }
    System.out.println(res);

  } main {
    Scanner sc = new Scanner(System.in);
    int a = sc.nextInt(),
        b = sc.nextInt(),
        c = sc.nextInt(),
        d = sc.nextInt(),
        e = sc.nextInt(),
        k = sc.nextInt();
    String res = "Yay!";    
    if (e - a > k){
        res = ":(";
    }
    System.out.println(res);

  } Scanner sc = new Scanner(System.in); sc new Scanner(System.in) int a = sc.nextInt() a sc.nextInt() sc.nextInt sc b = sc.nextInt() b sc.nextInt() sc.nextInt sc c = sc.nextInt() c sc.nextInt() sc.nextInt sc d = sc.nextInt() d sc.nextInt() sc.nextInt sc e = sc.nextInt() e sc.nextInt() sc.nextInt sc k = sc.nextInt(); k sc.nextInt() sc.nextInt sc String res = "Yay!"; res "Yay!" if (e - a > k){
        res = ":(";
    } e - a > k e - a e a k {
        res = ":(";
    } res = ":(" res ":(" System.out.println(res) System.out.println System.out System System.out res String[] args args public class Main{
  public static void main(String[] args){
    Scanner sc = new Scanner(System.in);
    int a = sc.nextInt(),
        b = sc.nextInt(),
        c = sc.nextInt(),
        d = sc.nextInt(),
        e = sc.nextInt(),
        k = sc.nextInt();
    String res = "Yay!";    
    if (e - a > k){
        res = ":(";
    }
    System.out.println(res);

  }
} public class Main{
  public static void main(String[] args){
    Scanner sc = new Scanner(System.in);
    int a = sc.nextInt(),
        b = sc.nextInt(),
        c = sc.nextInt(),
        d = sc.nextInt(),
        e = sc.nextInt(),
        k = sc.nextInt();
    String res = "Yay!";    
    if (e - a > k){
        res = ":(";
    }
    System.out.println(res);

  }
} Main
import java.util.*;
 
public class Main{
  public static void main(String[] args){
    Scanner sc = new Scanner(System.in);
    int a = sc.nextInt(),
        b = sc.nextInt(),
        c = sc.nextInt(),
        d = sc.nextInt(),
        e = sc.nextInt(),
        k = sc.nextInt();
    String res = "Yay!";    
    if (e - a > k){
        res = ":(";
    }
    System.out.println(res);

  }
}
