#include <iostream>
#include <string>
using namespace std;

int form();
int sum();
int slag();

int main() {
	try {
		cout << form() << endl;
	} catch (runtime_error err) {
		cout << err.what() << endl;
	}
	return 0;
}

int form() {
	int res = sum();
	char ch;
	cin >> ch;
	if (ch != '.') throw runtime_error("Это не точка!");
	return res;
}

int sum() {
	int a = slag();
	char ch;
	cin >> ch;
	if (ch == '+') return a + sum();
	if (ch == '-') return a - sum();
	cin.putback(ch);
	return a;
}

int slag() {
	char ch;
	cin >> ch;
	if (ch == '(') {
		int a = sum();
		cin >> ch;
		if (ch != ')') throw runtime_error("Нет закрывающей скобки!!!");
		return a;
	}
	cin.putback(ch);
	int a;
	cin >> a;
	return a;
}