#include <bits/stdc++.h>

using namespace std;

int dfs(string str) {
	stack<int> s;
	stack<char> c;
	int score = 0;
	char nowc = '+';
	for (int i = 0; i < str.size(); i++) {
		if (str[i] == '(') {
			for (int j = i + 1; j < str.size(); j++) {
				if (str[j] == '(') {
					s.push(j);
				}
				if (str[j] == ')') {
					if (s.size()) {
						s.pop();
						continue;
					}
					switch (nowc) {
					case '+':
						score += dfs(str.substr(i + 1, j - i - 1));
						break;
					case '-':
						score -= dfs(str.substr(i + 1, j - i - 1));
					}
					i = j;
				}
			}
		}
		else if (str[i] == '+' || str[i] == '-') {
			nowc = str[i];
		}
		else {
			switch (nowc)
			{
			case '+':
				score += str[i] - '0';
				break;
			case '-':
				score -= str[i] - '0';
				break;
			}
		}
	}
	return score;
}

void hawawa()
{
	string str;
	cin >> str;
	cout << dfs(str) << "\n";
}

int main()
{
	ios::sync_with_stdio(false);
	cin.tie(0);
	hawawa();
	return 0;
}