import java.io.*;
import java.util.*;
import java.math.*;
 
public class Main{
	public static void main(String[] args){
    	Scanner sc = new Scanner(System.in);
      	int sum = 0;  
  
      	for ( int i=0; i<3; i++ ){
        	sum += sc.nextInt();
        }
        
      	if ( sum >= 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