import java.util.*;

public class Main {

    public static void main(String[] arg) {

        Scanner scanner = new Scanner(System.in);
        long a1 = scanner.nextLong();
        long a2 = scanner.nextLong();
        long a3 = scanner.nextLong();

        if (a1+a2+a3 >= 22) {
            System.out.println("bust");
        } else {
            System.out.println("win");
        }

    }
}
/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