import java.util.*;

public class Main {
    public static void main(String[] args) throws Exception {
        Scanner sc = new Scanner(System.in);
        
        int[] num = new int[5];
        for (int i=0; i<5; i++) {
            num[i] = sc.nextInt();
        }
        int k = sc.nextInt();

        String result = "Yay!";
        out: for (int i=0; i<5; i++) {
           for (int j=i+1; j<5; j++) {
              if (Math.abs(num[i] - num[j]) > k) {
                  result = ":(";
                  break out;
              }
           }
        }
        
        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