import java.util.*;

public class Main {
    public static void main(String[] args) throws Exception {
        // Your code here!
        Scanner scan = new Scanner(System.in);
        Integer a1 = scan.nextInt();
        Integer a2 = scan.nextInt();
        Integer a3 = scan.nextInt();
        System.out.println(hantei(a1,a2,a3));
    }
    public static String hantei(int n,int m,int j){
        
    return (n+m+j)<=21? "win":"bust";
    }
}

/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