import java.util.*;
public class Main{
  public static void main(String[] args){
    Scanner sc = new Scanner(System.in);
    int current = sc.nextInt();
    int mini = current,maxi = current,distance = 0;
    do{
      int res = Math.max(Math.abs(current - mini), Math.abs(current - maxi));
      if(res > distance){distance = res;}
      current = sc.nextInt();
    }while(sc.hasNext());
    if(distance > current){System.out.println(":(");}
    else{System.out.println("Yay!");}
  }
}
/tmp/hf-datasets-cache/medium/datasets/42704881117311-config-parquet-and-info-qiankunmu-Project_CodeNet-896c9d36/hub/datasets--qiankunmu--Project_CodeNet_Python800_and_Java250/snapshots/c899fde44a77ba1cc14973ed3de064e4ff3aadc7/Project_CodeNet_Java250.tar.gz