import java.util.*;
public class Main {

    public static void main(String[] args) {
        Scanner yomi = new Scanner(System.in);
        int iti = yomi.nextInt();
        int ni = yomi.nextInt();
        int san = yomi.nextInt();
        if (iti+ni+san <= 21){
            System.out.println("win");
        }else System.out.println("bust");

    }
}

/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