func readInts() -> [Int] {
    return readLine()!.split(separator: " ").map { Int($0)! }
}
    
let abc = readInts()
let a = abc[0]
let b = abc[1]
let c = abc[2]
if (a+b+c)<=21{
  print("win")
}else{
  print("bust")
}