"use strict";
const Main = (input) =>{
   let xs = input.trim().split(' ').map(v=>parseInt(v,10));
   let ans = xs[0]+xs[1]+xs[2];
   if(ans<=21){
      console.log('win');
   }else{
      console.log('bust');
   }
}
Main(require('fs').readFileSync('/dev/stdin','utf8'));