import java.util.Scanner; 
class Main 
{ 
    public static void main(String[] args) 
    { 
        Scanner s = new Scanner(System.in); 
        int a,b,c;
        a = s.nextInt();
        b = s.nextInt();
        c = s.nextInt();
        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