import java.util.Scanner;

public class Main {
    public static void main(String[] args) {
        Scanner input = new Scanner(System.in);
        int A1, A2, A3;
        A1 = input.nextInt();
        A2 = input.nextInt();
        A3 = input.nextInt();
        if ((A1+A2+A3)>=22)
        System.out.print("bust\n");
        else System.out.print("win\n");
    }
}

/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