#include<iostream>
#include<string>

using namespace std;

typedef long long ll;

string S;
int i = 0;
ll f();
//---------------------------------------------------------------------------------------------------
ll g() {
	if ('0' <= S[i] and S[i] <= '9') {
		ll res = S[i] - '0';
		i++;
		return res;
	}
	if (S[i] == '(') {
		i++;
		ll res = f();
		i++;
		return res;
	}
}
ll f() {
	ll res = g();

	while (1) {
		if (S[i] == '+') {
			i++;
			res += g();
		}
		else if (S[i] == '-') {
			i++;
			res -= g();
		}
		else return res;
	}
}
//---------------------------------------------------------------------------------------------------
int main() {
	cin >> S;
	cout << f() << endl;

	return 0;
}