#include <fstream>
#include <string>
#include <stack>
#include <cassert>
using namespace std;

string name = "evaluare";
ifstream fin(name + ".in");
ofstream fout(name + ".out");

string expression;

bool isOperator(char ch)
{
    return ch == '+' || ch == '-' || ch == '*' || ch == '/';
}

int getPriority(char ch)
{
    if (ch == '+' || ch == '-')
    {
        return 1;
    }
    else if (ch == '*' || ch == '/')
    {
        return 2;
    }
    return -1;
}

void applyOperator(stack<int>& numbers, char op)
{
    int secondNo = numbers.top();
    numbers.pop();
    int firstNo = numbers.top();
    numbers.pop();
    switch (op)
    {
    case '+':
    {
        numbers.push(firstNo + secondNo);
        break;
    }
    case '-':
    {
        numbers.push(firstNo - secondNo);
        break;
    }
    case '*':
    {
        numbers.push(firstNo * secondNo);
        break;
    }
    case '/':
    {
        numbers.push(firstNo / secondNo);
        break;
    }
    }
}

int main()
{
    fin >> expression;
    stack<int> numbers;
    stack<char> operators;
    for (size_t i = 0; i < expression.size(); i++)
    {
        if (expression[i] == '(')
        {
            operators.push('(');
        }
        else if (expression[i] == ')')
        {
            while (operators.top() != '(')
            {
                applyOperator(numbers, operators.top());
                operators.pop();
            }
            operators.pop();
        }
        else if (isOperator(expression[i]))
        {
            while (!operators.empty() && getPriority(operators.top()) >= getPriority(expression[i]))
            {
                applyOperator(numbers, operators.top());
                operators.pop();
            }

            operators.push(expression[i]);
        }
        else
        {
            assert(isdigit(expression[i]));
            int number = 0;
            while (i < expression.size() && isdigit(expression[i]))
            {
                number = number * 10 + expression[i++] - '0';
            }
            i--;
            numbers.push(number);
        }
    }

    while (!operators.empty())
    {
        applyOperator(numbers, operators.top());
        operators.pop();
    }

    fout << numbers.top() << "\n";
    return 0;
}