#include <bits/stdc++.h>
using namespace std;
vector<int> point;
string S;
pair<int, int> solve(int s) {
if (S[s] == '?') return {0, 0};
int flip = S[s + 2] == 'n';
pair<int, int> res1, res2;
if (S[s + 4] == '?') {
res1 = { 0, 0 };
s += 6;
}
else {
res1 = solve(s + 4);
s = point[s + 7] + 2;
}
if (S[s] == '?') res2 = { 0, 0 };
else res2 = solve(s);
if (flip) return { min(res1.first, res2.first), res1.second + res2.second + 1 };
return { res1.first + res2.first + 1, min(res1.second, res2.second) };
}
signed main() {
ios_base::sync_with_stdio(0); cin.tie(0); cout.tie(0);
cin >> S;
int N = 0;
point.resize(S.size(), -1);
stack<int> idxs;
for (int i = S.size() - 1; i >= 0; i--) {
if (S[i] == ')') idxs.push(i);
else if (S[i] == '(') {
point[i] = idxs.top();
idxs.pop();
}
N += S[i] == '?';
}
auto res = solve(0);
cout << N - res.first - res.second << '\n';
}
