!752

p {

  makeBot("Add Bot.");

}

static S answer(S s) {

  L<S> tok = javaTok(s);

  int i;

  Long result = null;

  while ((i = matchMeta(tok, "<number>", "+", "<number>")) >= 0) {

    long a = parseLong(tok.get(i)), b = parseLong(tok.get(i+4));

    result = a+b;

    clearAllTokens(tok.subList(i, i+5));

    tok.set(i, "" + result);

    tok = javaTok(tok);

  }

  if (result != null) ret "" + result;

  ret null;

}