public class 京东_括号匹配方案 {

public static void main(String[] args) {

// TODO Auto-generated method stub

Scanner in = new Scanner(System.in);

String str = in.nextLine().trim();

char[] chars = str.toCharArray();

ArrayList<Character> list = new ArrayList<>();

for(int i=0;i<chars.length;i++)

list.add(chars[i]);

//System.out.println(list.lastIndexOf('('));

int count = 1;

while(!list.isEmpty()){

int index = list.lastIndexOf('(');

count *= (list.size()-index-1);

list.remove(list.size()-1);

list.remove(index);

}

System.out.println(count);

}

}