import java.util.Scanner;

fun main (args : Array<String>) {
  val input = Scanner(System.`in`)
  
  while (input.hasNext()) {
    var sum = 0
    
    for (i in 1..3) {
      sum += input.nextInt()
    }
    
    if (sum >= 22) {
      println("bust")
    } else {
      println("win")
    }    
  }
}