#include<iostream>
#include<string>
#include<algorithm>
#include<vector>
#include<queue>
#include<map>
#include<math.h>
#include<iomanip>
#include<set>
#include<numeric>
#include<cstring>
#include<cstdio>
#include<functional>
#include<bitset>
#include<limits.h>
#include<cassert>
#include<iterator>
#include<complex>
#include<stack>
using namespace std;
#define lint long long int
/*
vector<char>al(26);
al = {'a','b','c','d','e','f','g','h','i','j','k','l','m','n','o','p','q','r','s','t','u','v','w','x','y','z'};
vector<char>AL(26);
AL = {'A','B','C','D','E','F','G','H','I','J','K','L','M','N','O','P','Q','R','S','T','U','V','W','X','Y','Z'};
*/


int main() {
	string s;
	cin >> s;
	string S = s;
	int Z = S.size();
	int cnt = 0;
	for (int i = 1; i < Z; i++) {
		if (S[i-1] == '-' && S[i]=='(') {
			cnt++;
		}
		else if (S[i] == ')'&&cnt>0) {
			cnt--;
		}
		else if (S[i] == '+' && cnt == 1) {
			S[i] = '-';
		}
		else if (S[i] == '-' && cnt == 1) {
			S[i] = '+';
		}
	}
	int cntc = 0;
	for (int i = 0; i < Z; i++) {
		if (S[i] == '(' || S[i] == ')') {
			cntc++;
		}
	}
	int z = Z - cntc;
	int cntd = 0;
	vector<char>vec(z);
	for (int i = 0; i < Z; i++) {
		if (S[i] != '(' && S[i] != ')') {
			vec[cntd] = S[i];
			cntd++;
		}
	}
	int ans = int(vec[0] - '0');
	char sc;
	char si;
	for (int i = 1; i <= z / 2; i++) {
		sc = vec[i * 2 - 1];
		si = int(vec[i * 2] - '0');
		if (sc == '+') {
			ans += si;
		}
		else if (sc == '-') {
			ans -= si;
		}
	}
	cout << ans << endl;
}