#include "bits/stdc++.h"

using namespace std;
using ll = long long;
const double pi = acos(-1);
#define FOR(i,a,b) for (ll i=(a),__last_##i=(b);i<__last_##i;i++)
#define RFOR(i,a,b) for (ll i=(b)-1,__last_##i=(a);i>=__last_##i;i--)
#define REP(i,n) FOR(i,0,n)
#define RREP(i,n) RFOR(i,0,n)
#define __GET_MACRO3(_1, _2, _3, NAME, ...) NAME
#define rep(...) __GET_MACRO3(__VA_ARGS__, FOR, REP)(__VA_ARGS__)
#define rrep(...) __GET_MACRO3(__VA_ARGS__, RFOR, RREP)(__VA_ARGS__)
template<typename T> ostream& operator<<(ostream& os, const vector<T>& v) {
	REP(i, v.size()) { if (i)os << " "; os << v[i]; }return os;
}
template<typename T> ostream& operator<<(ostream& os, const vector<vector<T>>& v) {
	REP(i, v.size()) { if (i)os << endl; os << v[i]; }return os;
}

const ll INF = LLONG_MAX;
ll MOD = 1000000007;
ll _MOD = 1000000009;
double EPS = 1e-10;

#define int long long

inline void my_io() {

	std::ios::sync_with_stdio(false);

	std::cin.tie(0);

	cout << fixed << setprecision(16);

	//cout << setprecision(10) << scientific << ans << endl;
}

signed main() {
	string s;

	cin >> s;

	string num = "";
	ll ans = 0;
	bool op;

	REP(i, s.size()) {
		if (i > 0 && s[i] == '+' && s[i - 1] != '+' && s[i - 1] != '-') {
			op = false;
			ans = stoll(num);
			num = "";
		}else if (i > 0 && s[i] == '-' && s[i - 1] != '+' && s[i - 1] != '-') {
			op = true;
			ans = stoll(num);
			num = "";
		}
		else {
			num += s[i];
		}
	}

	if (op) {
		ans += stoll(num);
	}
	else {
		ans -= stoll(num);
	}

	cout << ans << endl;
}