"use strict";
// import bigInt from 'big-integer'

const Main = input => {
  input = input.trim().split(" ");
  if (
    parseInt(input[0], 10) + parseInt(input[1], 10) + parseInt(input[2], 10) <=
    21
  )
    console.log("win");
  else console.log("bust");
};

Main(require("fs").readFileSync("/dev/stdin", "utf8"));
