import java.util.*;
import java.io.*;

public class Main{
 public static void main(String[] args){
   Scanner s = new Scanner(System.in);
   int[] arr = new int[5];
   for(int i=0; i<5; i++){
   arr[i] = s.nextInt();
   }
   
   int maxd = s.nextInt();
   String status ="Yay!";
   
   outerloop:
   for(int j=0; j<4; j++){
   for(int l=j+1; l<5; l++){
   if(arr[l]-arr[j] > maxd){
   status =":(";
     break outerloop;
   }
   }
   }
   System.out.print(status);
 }
}
/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