import java.util.Scanner;

public class Main{

  public static void main(String[] args) {
    Scanner sc = new Scanner(System.in);
    int a1,a2,a3;
    a1 = sc.nextInt();
    a2 = sc.nextInt();
    a3 = sc.nextInt();
    if(a1+a2+a3 > 21) {
      System.out.println("bust");
    }else {
      System.out.println("win"); //System.err.println("win");から修正
    }
    sc.close();
  }
}

/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