import java.util.*;


public class Main {
  public static void main(String[] args) {

    Scanner sc = new Scanner(System.in);
    String[] data = sc.nextLine().split(" ");

    int a = Integer.parseInt(data[0]);
    int b = Integer.parseInt(data[1]);
    int c = Integer.parseInt(data[2]);

    if (a+b+c >= 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