import java.util.*;

public class Main{
  public static void main(String[] args){
    Scanner sc = new Scanner(System.in);
    
    int a = sc.nextInt();
    int b = sc.nextInt();
    int c = sc.nextInt();
    int d = sc.nextInt();
    int e = sc.nextInt();
    int k = sc.nextInt();
    if(e-a<=k && e-a>0){
      System.out.println("Yay!");
    }else{
      System.out.println(":(");
    }
  }
} import java.util.*; util.* java public class Main{
  public static void main(String[] args){
    Scanner sc = new Scanner(System.in);
    
    int a = sc.nextInt();
    int b = sc.nextInt();
    int c = sc.nextInt();
    int d = sc.nextInt();
    int e = sc.nextInt();
    int k = sc.nextInt();
    if(e-a<=k && e-a>0){
      System.out.println("Yay!");
    }else{
      System.out.println(":(");
    }
  }
} Main public static void main(String[] args){
    Scanner sc = new Scanner(System.in);
    
    int a = sc.nextInt();
    int b = sc.nextInt();
    int c = sc.nextInt();
    int d = sc.nextInt();
    int e = sc.nextInt();
    int k = sc.nextInt();
    if(e-a<=k && e-a>0){
      System.out.println("Yay!");
    }else{
      System.out.println(":(");
    }
  } main {
    Scanner sc = new Scanner(System.in);
    
    int a = sc.nextInt();
    int b = sc.nextInt();
    int c = sc.nextInt();
    int d = sc.nextInt();
    int e = sc.nextInt();
    int k = sc.nextInt();
    if(e-a<=k && e-a>0){
      System.out.println("Yay!");
    }else{
      System.out.println(":(");
    }
  } Scanner sc = new Scanner(System.in); sc new Scanner(System.in) int a = sc.nextInt(); a sc.nextInt() sc.nextInt sc int b = sc.nextInt(); b sc.nextInt() sc.nextInt sc int c = sc.nextInt(); c sc.nextInt() sc.nextInt sc int d = sc.nextInt(); d sc.nextInt() sc.nextInt sc int e = sc.nextInt(); e sc.nextInt() sc.nextInt sc int k = sc.nextInt(); k sc.nextInt() sc.nextInt sc if(e-a<=k && e-a>0){
      System.out.println("Yay!");
    }else{
      System.out.println(":(");
    } e-a<=k && e-a>0 e-a<=k e-a e a k e-a>0 e-a e a 0 {
      System.out.println("Yay!");
    } System.out.println("Yay!") System.out.println System.out System System.out "Yay!" {
      System.out.println(":(");
    } System.out.println(":(") System.out.println System.out System System.out ":(" String[] args args public class Main{
  public static void main(String[] args){
    Scanner sc = new Scanner(System.in);
    
    int a = sc.nextInt();
    int b = sc.nextInt();
    int c = sc.nextInt();
    int d = sc.nextInt();
    int e = sc.nextInt();
    int k = sc.nextInt();
    if(e-a<=k && e-a>0){
      System.out.println("Yay!");
    }else{
      System.out.println(":(");
    }
  }
} public class Main{
  public static void main(String[] args){
    Scanner sc = new Scanner(System.in);
    
    int a = sc.nextInt();
    int b = sc.nextInt();
    int c = sc.nextInt();
    int d = sc.nextInt();
    int e = sc.nextInt();
    int k = sc.nextInt();
    if(e-a<=k && e-a>0){
      System.out.println("Yay!");
    }else{
      System.out.println(":(");
    }
  }
} Main
import java.util.*;

public class Main{
  public static void main(String[] args){
    Scanner sc = new Scanner(System.in);
    
    int a = sc.nextInt();
    int b = sc.nextInt();
    int c = sc.nextInt();
    int d = sc.nextInt();
    int e = sc.nextInt();
    int k = sc.nextInt();
    if(e-a<=k && e-a>0){
      System.out.println("Yay!");
    }else{
      System.out.println(":(");
    }
  }
}