#include <bits/stdc++.h>
using namespace std;
typedef long long ll;
typedef long long int lli; 
typedef pair < int, int> dbl; 
const int maxInt = 1e9*2;
const lli maxLong = 1e18*2;

bool operand(char ch){
		if(ch >= '0' && ch <= '9')
			return(1);
		return(0);
}

bool operator0(char ch){
	if(ch == '+' || ch == '/' || ch == '*' || ch == '-')
		return(1);
	return(0);
}

bool lessOp(char op, char op2){
	if((op == '+' || op == '-') && (op2 == '/' || op2 == '*'))
		return(1);
	return(0);
}

int toInt(string cnt){
		istringstream ss(cnt);
		int val;
		ss >> val;
		return(val);
}

int toOp(char ch){
	if(ch == '+')
		return(-1);
	if(ch == '-')
		return(-2);
	if(ch == '*')
		return(-3);
	if(ch == '/')
		return(-4);
}

int main(){
	ifstream cin("evaluare.in");
	ofstream cout("evaluare.out");
	ios::sync_with_stdio(0);
	string str;
	//string ans;
	vector <int> ans;
	stack <char> stk;
	cin >> str;
	for(int i = 0; (unsigned)i < str.size(); i++){
		if(operand(str[i])){
			string cnt;
			while(operand(str[i])){
				cnt+=str[i];
				i++;
			}
			i--;
			//ans+=str[i];
			ans.push_back(toInt(cnt));
		}
		else
			if(operator0(str[i])){
					while(!stk.empty() && lessOp(str[i], stk.top())){
						//ans+=stk.top();
						ans.push_back(toOp(stk.top()));
						stk.pop();
					}
				stk.push(str[i]);
			}
		else if(str[i] == '(')
				stk.push(str[i]);
		else if(str[i] == ')'){
				while(stk.top() != '('){
					ans.push_back(toOp(stk.top()));
					stk.pop();
				}
				stk.pop();
		}
			
	}
	while(!stk.empty()){
		ans.push_back(toOp(stk.top()));
		stk.pop();
	}
	stack <int> count;
	for(int i = 0; (unsigned)i < ans.size(); i++){
		if(ans[i] >= 0)
			count.push(ans[i]);
		else if(ans[i] < 0){
				int a, b, c;
				a = count.top();
				count.pop();
				b = count.top();
				count.pop();
				if(ans[i] == -1)
					c = a + b;
				else 
				if(ans[i] == -2)
					c = a - b;
				else
				if(ans[i] == -3)
					c = a * b;
				else
				if(ans[i] == -4)
					c = b / a;
				count.push(c);
		}
	}
	/*
	for(int i = 0; i < ans.size(); i++){
	if(ans[i] == -1)
		cout << '+' << ' ' ;
	else
	if(ans[i] == -2)
		cout << '-' << ' ';
	else
	if(ans[i] == -3)
		cout << '*' << ' ';
	else
	if(ans[i] == -4)
	cout << '/' << ' ';
	else cout << ans[i] << ' ';
	} */
	//cout << ans;
	cout << count.top();
	return(0);
}