"use strict";

function main(input) {
  input = input.trim().split(" ");
  const num = Number(input[0]) + Number(input[1]) + Number(input[2]);
  if (num >= 22) {
    console.log("bust");
  } else {
    console.log("win");
  }
}

main(require("fs").readFileSync("/dev/stdin", "utf-8"));
