import java.util.*;

public class Main {
    public static void main(String[] args) throws Exception {
        Scanner scan = new Scanner(System.in);

        int num = 0;
        int min = 0;
        int max = 0;
        min = scan.nextInt();
        scan.nextInt();
        scan.nextInt();
        scan.nextInt();
        max = scan.nextInt();
        int k = scan.nextInt();
        
        if ((max - min) > k){
            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