#include <bits/stdc++.h>

using namespace std;

#define f first
#define s second
#define pb push_back
#define ll long long
#define mp make_pair

int n;
vector<char> oper;
vector<int> val;

inline void operation() {
	char c = oper.back();
	oper.pop_back();
	int b = val.back();
	val.pop_back();
	int a = val.back();
	val.pop_back();
	if (c == '*') {
		val.pb(a * b);
	}
	if (c == '/') {
		val.pb(a / b);
	}
	if (c == '+') {
		val.pb(a + b);
	}
	if (c == '-') {
		val.pb(a - b);
	}
	//cerr << c << ' ' << val.back() << endl;
}

int main() {
	freopen("evalhard.in", "r", stdin);
	freopen("evalhard.out", "w", stdout);
	ios_base::sync_with_stdio(0);
	cin.tie(0);
	string s;
	cin >> s;
	s = s + ')';
	int n = s.size();
	oper.pb('(');
	for (int i = 0; i < n; ++i) {
		if ('0' <= s[i] && s[i] <= '9') {
			int v = s[i] - '0';
			while ('0' <= s[i + 1] && s[i + 1] <= '9') {
				++i;
				v *= 10;
				v += s[i] - '0';
			}
			val.pb(v);
		}
		else {
			if (s[i] != ')') {
				if (s[i] != '(') {
					while (oper.back() != '(' && (oper.back() == '/' || oper.back() == '*' || s[i] == '+' || s[i] == '-')) {
						operation();
					}
				}
				oper.pb(s[i]);
			}
			else {
				while (oper.back() != '(') {
					operation();
				}
				oper.pop_back();
			}
		}
	}
	assert(val.size() == 1);
	assert(oper.size() == 0);
	cout << val.back();
}