import java.util.Scanner;
import java.io.*;
class Main
{
public static void main(String args[])
{
  int i,j,k;
  Scanner sc = new Scanner(System.in);
  i = sc.nextInt();
  j = sc.nextInt();
  k = sc.nextInt();
  i = i+j;
  i = i+k;
  if(i>=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