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