import java.util.Scanner;
import java.lang.String;

public class Main {

    public static void main(String[] args) {
        int A1, A2, sum, A3;
        Scanner scan = new Scanner(System.in);
        A1 = scan.nextInt();
		A2 = scan.nextInt();
      	A3 = scan.nextInt();
        sum = A1+A2+A3;
      	if(sum>=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