'use strict';

const input = require("fs").readFileSync("/dev/stdin", "utf8");
const list = input.trim().split(' ').map(Number);

let sum = 0;
for (let i = 0; i < list.length; i++) {
    sum += list[i];
}

const result = sum > 21 ? 'bust' : 'win';
console.log(result);
