#include <bits/stdc++.h>
using namespace std;
typedef int64_t ll;
typedef string str;
int n;
str s;
pair <int, int> get_range(int i) {
if (s[i] == '?') {
return {1, n};
} else if (s[i + 2] == 'x') {
int comma, cnt = 0;
for (int j = i + 4; ; ++j) {
if (s[j] == ',' && !cnt) {
comma = j;
break;
}
if (s[j] == '(') {
++cnt;
}
if (s[j] == ')') {
--cnt;
}
}
pair <int, int> range_left = get_range(i + 4), range;
pair <int, int> range_right = get_range(comma + 1);
range.second = max(range_left.second, range_right.second);
range.first = range_left.first + range_right.first;
return range;
} else {
int comma, cnt = 0;
for (int j = i + 4; ; ++j) {
if (s[j] == ',' && !cnt) {
comma = j;
break;
}
if (s[j] == '(') {
++cnt;
}
if (s[j] == ')') {
--cnt;
}
}
pair <int, int> range_left = get_range(i + 4), range;
pair <int, int> range_right = get_range(comma + 1);
range.second = range_left.second + range_right.second - n - 1;
range.first = min(range_left.first, range_right.first);
return range;
}
}
signed main() {
ios::sync_with_stdio(false);
cin.tie(nullptr);
cin >> s;
n = count(s.begin(), s.end(), '?');
pair <int, int> range = get_range(0);
cout << range.second - range.first + 1;
}
