import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.text.DecimalFormat;
import java.util.*;
/** * Created by humac on 2017/9/7. */
public class Main {
public static void main(String args[]) throws IOException {
Scanner sc = new Scanner(System.in);
while (sc.hasNext()) {
String s = sc.next();
}
}
private static void function(String s) {
Queue queue = new LinkedList();
int count = 1;
char[] chars = s.toCharArray();
queue.add(chars[0]);
for (int i = 1; i < chars.length; i++) {
if (chars[i] == '(') {
queue.add(chars[i]);
} else {
count = count * queue.size();
queue.poll();
}
}
System.out.println(count);
}
}