import java.util.Scanner;
public class Main {
    public static void main(String[] args){

        Scanner scanner = new Scanner(System.in);
        int a1 = scanner.nextInt();
        int a2 = scanner.nextInt();
        int a3 = scanner.nextInt();
        if(a1 +a2 +a3 >=22)

        {
            System.out.print("bust");
        } else

        {
            System.out.print("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