#include "bits/stdc++.h"

using namespace std;

using ll = long long;
using ld = long double;

const int INF = (1 << 30) - 1;
const ll INF64 = ((ll)1 << 62) - 1;
const double PI = 3.1415926535897932384626433832795;

const int dx[] = { 0, 1, 0, -1 };
const int dy[] = { -1, 0, 1, 0 };

int gcd(int x, int y) { return y ? gcd(y, x % y) : x; }
ll gcd(ll x, ll y) { return y ? gcd(y, x % y) : x; }
int lcm(int x, int y) { return x / gcd(x, y) * y; }
ll lcm(ll x, ll y) { return x / gcd(x, y) * y; }

int solve(string s) {
	int res = 0;
	int op = 1;

	for (int i = 0; i < (int)s.size(); i++) {
		int endPos = i;
		switch (s[i]) {
		case '(':
			for (; endPos < (int)s.size(); endPos++) {
				if (s[endPos] == ')') {
					break;
				}
			}

			res += op * solve(s.substr(i + 1, endPos - i - 1));
			i = endPos;
			break;
		case '+':
			op = 1;
			break;
		case '-':
			op = -1;
			break;
		default:
			res += op * (int)(s[i] - '0');
			break;
		}
	}

	return res;
}

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

	string s;
	cin >> s;

	cout << solve(s) << endl;
	return 0;
}