#include <bits/stdc++.h>
using namespace std;
template <typename Arg1>
void __f(const char* name, Arg1&& arg1) {
  cerr << name << ": " << arg1 << endl;
}
template <typename Arg1, typename... Args>
void __f(const char* names, Arg1&& arg1, Args&&... args) {
  const char* comma = strchr(names + 1, ',');
  cerr.write(names, comma - names) << ": " << arg1 << " |";
  __f(comma + 1, args...);
}
const long long maxn = (long long)5e3 + 100;
const long long maxm = (long long)52;
const int LOGN = 22;
const long long INF = 1e15 + 10;
const long long MOD = 1e9 + 7;
const double PI = acos(-1.0);
const double EPS = 1e-12;
int match[maxn][maxn];
int main() {
  ios_base::sync_with_stdio(0);
  cin.tie(0);
  cout.tie(0);
  string line;
  while (cin >> line) {
    int n = line.size();
    int ans = 0;
    for (int i = 0; i < n; ++i) {
      int c1 = 0, c2 = 0;
      for (int j = i; j < n; ++j) {
        if (line[j] == '(') {
          ++c1;
          ++c2;
        } else if (line[j] == ')') {
          --c1;
          --c2;
        } else {
          ++c1;
          --c2;
        }
        if (c1 < 0) {
          break;
        }
        if (c2 < 0) {
          c2 += 2;
        }
        if (c2 == 0) {
          ++ans;
        }
      }
    }
    cout << ans << endl;
  }
  return 0;
}
