function main(arg) {
	arg = arg.trim().split(' ');
  	arg = arg.map(str => parseInt(str, 10));
	var bj = 21, result;
	result = arg[0] + arg[1] + arg[2];
  if (result <= bj) {
  	console.log('win');
  } else {
  	console.log('bust');
  }
}
main(require('fs').readFileSync('/dev/stdin', 'utf8'));