#include <bits/stdc++.h>
using std::cout;
using std::endl;
using std::cin;

int st = 0;
std::string s;

int func() {
	int ret = 0;
	
	if('0' <= s[st] and s[st] <= '9') {
		ret = s[st] - '0';
		st++;
	} else if(s[st] == '(') {
		st += 1;
		ret += func();
	}
		
	for(; st < s.size(); st += 2) {
		if(s[st] == '+') {
			if(s[st + 1] == '(') {
				st += 2;
				ret += func();
			} else {
				ret += s[st + 1] - '0';
			}
		} else if(s[st] == '-') {
			if(s[st + 1] == '(') {
				st += 2;
				ret -= func();
			} else {
				ret -= s[st + 1] - '0';
			}
		}
		
		if(s[st] == ')'){
			st--;
			return ret;
		}
	}
	
	return ret;
}

int main(){
	cin >> s;
	
	cout << func() << endl;
	return 0;
}