#include <bits/stdc++.h>

using namespace std;

int prec (char c)
{
    if (c == '-' or c == '+')
        return 1;
    return 2;
}

bool isOp (char c)
{
    return c == '+' or c == '-' or c == '*' or c == '/';
}

bool isDigit (char c)
{
    return c >= '0' and c <= '9';
}

int execute (int a, char c, int b)
{
    if (c == '+') return a + b;
    else if (c == '-') return a - b;
    else if (c == '*') return a * b;
    else if (c == '/') return a / b;
    else assert(0);
}

ifstream input ("evaluare.in");
ofstream output("evaluare.out");

int main() {
    string s;
    input >> s;
    stack <char> operators;
    stack <int> values;
    for (int index = 0; index < (int)s.size(); ++ index)
    {
        auto &elem = s[index];
        if (elem == '(')
            operators.push(elem);
        else if (elem == ')')
        {
            if (operators.top() == '(')
                operators.pop();
            else
            {
                while (operators.top() != '(') {
                    int top1 = values.top();
                    values.pop();
                    int top2 = values.top();
                    values.pop();
                    values.push(execute(top2, operators.top(), top1));
                    operators.pop();
                }
                assert(operators.top() == '(');
                operators.pop();
            }
        }
        else if (isOp(elem))
        {
            if (values.empty())
                goto jump;
            while (operators.size() and isOp(operators.top()) and prec(operators.top()) >= prec(elem))
            {
                int top1 = values.top();
                values.pop();
                int top2 = values.top();
                values.pop();
                values.push(execute(top2, operators.top(), top1));
                operators.pop();
            }
            operators.push(elem);
        }
        else
        {
            jump:
            bool minus = false;
            if (elem == '-') {
                minus = true;
                index += 1;
            }
            assert(isDigit(s[index]));
            int number = 0;
            while (index < (int)s.size() and isDigit(s [index]))
            {
                number = number * 10 + s[index] - '0';
                index += 1;
            }
            if (index < (int)s.size()) index -= 1;
            if (minus) number = -number;
            values.push(number);
        }
    }
    while (operators.size())
    {
        int top1 = values.top(); values.pop();
        int top2 = values.top(); values.pop();
        values.push(execute(top2, operators.top(), top1));
        operators.pop();
    }
    assert(values.size() == 1);
    output << values.top() << '\n';
    return 0;
}