//好不容易 做出来一题，第二题始终20%。回家喂牛哦
public static void main(String[] args) {
    Scanner scanner = new Scanner(System.in);
    String str = scanner.nextLine();
    List<Character> list = new ArrayList<>();
    for (int i = 0; i < str.length(); i++) {
        list.add(str.charAt(i));
    }
    int index = 1;
    int result = 1;
    while(!list.isEmpty()){
        if (list.get(index)==')'){
            result *= index;
            list.remove(index);
            list.remove(index-1);
            index = index-1;
        }else{
            index++;
        }
    }
    System.out.println(result);
}