"use strict";
    
const main = arg => {
    arg = arg.trim().split("\n");
    const A = parseInt(arg[0].split(" ")[0]);
    const B = parseInt(arg[0].split(" ")[1]);
    const C = parseInt(arg[0].split(" ")[2]);
    
    const sum = A + B + C;
    
    console.log(sum < 22 ? "win" : "bust");
}
main(require('fs').readFileSync('/dev/stdin', 'utf8'));