import java.util.*;

public class Main {
  public static void main(String[] args ) throws Exception {
    Scanner sc = new Scanner(System.in);
    int[] Antennas= new int[5];
    boolean abc=false;
    for (int i = 0; i < 5; i++) {
      int Antenna=sc.nextInt();
      Antennas[i]=Antenna;
    }
    int Distanse=sc.nextInt();
   
    for(int i=0;i<4;i++){
      for(int j=1;j<5;j++){
        if(Math.abs(Antennas[i]-Antennas[j])>Distanse){
          abc=true;
        }
     }
  }
    if(abc==true){
      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