#define _USE_MATH_DEFINES
#include  <cmath>
#include <cstdio>
#include <vector>
#include <iostream>
#include <algorithm>
#include <string>
#include<math.h>
#include<iomanip>
#include<stdio.h>
#include <stdlib.h>
#include<stdio.h>
#include <queue>
#include<map>
#include <sstream>
#include<set>
#include<stack>

//#include<bits/stdc++.h>


using namespace std;



int main() {


	string p;
	cin >> p;
	int ans = 0;
	bool g = 0;
	for (int i = 0; i < p.size(); i++) {
		if (p[i] == '+')g = 0;
		else if (p[i] == '-')g = 1;

		else if (p[i] >= '0'&&p[i] <= '9') {
			int b = p[i] - '0';
			if (!g)ans += b;
			else ans -= b;
			g = 0;
		}

		else if (p[i] == '(') {
			int a = 0;
			bool f = 0;
			for (int j = i+1; p[j] != ')';j++) {
				if (p[j] == '-')f = 1;
				else if (p[j] == '+')f = 0;
				else {
					int b = p[j] - '0';
					if (!f)a += b;
					else a -= b;
					f = 0;
				}
				i++;
			//	cout << "  a  " << a << endl;
				
			}

			if(!g)ans += a;
			else ans -= a;
			g = 0;
			i++;
		}
		//cout << ans << endl;
	}

	cout << ans << endl;

	return 0;




}