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

public class Main {
  public static void main(String[] args) throws IOException {
    BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
    
    int[] antenna = new int[5];
    for (int i = 0; i < 5; i++){
      antenna[i] = Integer.parseInt(br.readLine());
    }
    int k = Integer.parseInt(br.readLine());
    Arrays.sort(antenna);
    String result = "Yay!";
    if (antenna[4] - antenna[0] > k){
      result = ":(";
    }
    System.out.println(result);
  }
}

/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