#include <bits/stdc++.h>
using namespace std;
#define FOR(i,a,b) for(int i=(a);i<(b);++i)
#define REP(i,n) FOR(i,0,n)
#define ALL(v) begin(v),end(v)
template<typename A, typename B> inline bool chmax(A & a, const B & b) { if (a < b) { a = b; return true; } return false; }
template<typename A, typename B> inline bool chmin(A & a, const B & b) { if (a > b) { a = b; return true; } return false; }
using ll = long long;
using pii = pair<int, int>;
constexpr ll INF = 1ll<<30;
constexpr ll longINF = 1ll<<60;
constexpr ll MOD = 1000000007;
constexpr bool debug = false;
//---------------------------------//

int f2(const string &, int &);

int f1(const string & s, int & pos) {
	int res = f2(s, pos);
	while (pos < s.size() && s[pos] != ')') {
		char op = s[pos++];
		int n = f2(s, pos);
		if (op == '+') res += n;
		else res -= n;
	}
	return res;
};

int f2(const string & s, int & pos) {
	int res;
	if (s[pos] == '(') {
		++pos;
		res = f1(s, pos);
		++pos;
	}
	else res = s[pos++] - '0';
	return res;
}

int main() {
	string S;
	cin >> S;
	
	int pos = 0;
	cout << f1(S, pos) << endl;
}