function main(input) {
    const S = input.split(' ');
    const a = parseInt(S[0], 10);
    const b = parseInt(S[1], 10);
    const c = parseInt(S[2], 10);

    if (a+b+c >= 22) {
      console.log("bust");
    }else {
      console.log("win");
    }
}
main(require('fs').readFileSync('/dev/stdin', 'utf8'));

