#include <bits/stdc++.h>


using namespace std;
typedef long long ll;
#define REP(i,n) for(int i=0; i<int(n); i++)
#define FOR(i,m,n) for(int i=int(m); i<int(n); i++)
#define ALL(obj) (obj).begin(),(obj).end()
#define VI vector<int>
#define VLL vector<long long>
#define VVI vector<vector<int>>
#define VVLL vector<vector<long long>>
#define VC vector<char>
#define VS vector<string>
#define VVC vector<vector<char>>
#define VB vector<bool>
#define VVB vector<vector<bool>>
#define fore(i,a) for(auto &i:a)

typedef pair <int, int> P;
template<class T> bool chmax(T &a, T b) { if (a < b) { a = b; return true; } return false; }
template<class T> bool chmin(T &a, T b) { if (a > b) { a = b; return true; } return false; }
const int  INF = 1 << 29;
const ll INFL = 1LL << 60;
const ll mod = 1000000007;





int main() {
	string s;
	cin >> s;

	int ans = 0;
	int cur = 0;
	bool b = false;
	char c='_';
	char d = '_';

	if ('0' <= s[0] && s[0] <= '9') {
		ans = s[0] - '0';
	}
	else b = true;

	FOR(i, 1, s.size()) {
		if ('0' <= s[i] && s[i] <= '9') {
			int a = s[i] - '0';
			if (b) {
				if (c == '_')cur = a;
				else if (c == '+')cur += a;
				else cur -= a;
			}
			else {
				if (c == '+')ans += a;
				else ans -= a;
			}
		}
		else if (s[i] == '+')c = '+';
		else if (s[i] == '-')c = '-';
		else if (s[i] == '(') {
			d = s[i - 1];
			c = '_';
			b = true;
		}
		else {
			b = false;
			if (d == '+'||d=='_')ans += cur;
			else ans -= cur;
			cur = 0;
		}
	}
	cout << ans << endl;

}