#include <bits/stdc++.h>
using namespace std;
char s[5010];
int main() {
  scanf("%s", s);
  int n = (int)strlen(s);
  int res = 0;
  for (int i = 0; i < n; i++) {
    int cnt1 = 0, cnt2 = 0;
    for (int j = i; j < n; j++) {
      if (s[j] == '(') cnt1++;
      if (s[j] == ')') cnt1--;
      if (s[j] == '?') cnt2++;
      if (cnt2 && cnt2 > cnt1) cnt2--, cnt1++;
      if (cnt1 < 0) break;
      if (cnt2 == cnt1) res++;
    }
  }
  printf("%d", res);
  return 0;
}
