#include <bits/stdc++.h>

using namespace std;

ifstream fin("evaluare.in");
ofstream fout("evaluare.out");

string sir;

stack < int > val;
stack < char > op;

map < char, int > m;

int Calc(char o, int a, int b)
{
    switch (o)
    {
    case '+' :
        return a + b;

    case '-' :
        return a - b;

    case '*' :
        return a * b;

    case '/' :
        return a / b;
    }
}

int main()
{
    fin >> sir;

    m['*'] = 10;
    m['/'] = 10;
    m['+'] = 1;
    m['-'] = 1;
    m['('] = -1;

    bool g;

    for(int i = 0; i < sir.length(); i++)
    {

        if (sir[i] == '(')
        {
            g = 0;
            op.push('(');
        }
        else if (sir[i] == ')')
        {
            if (g)
            {
                while (!op.empty() && op.top() != '(')
                {
                    char o = op.top();
                    op.pop();

                    int a = val.top();
                    val.pop();

                    int b = val.top();
                    val.pop();

                    val.push(Calc(o, b, a));
                }
            }

            if (!op.empty())
                op.pop();
        }
        else if (isdigit(sir[i]))
        {
            int nr = 0;

            while (isdigit(sir[i]))
            {
                nr = nr * 10 + sir[i] - '0';
                i++;
            }

            i--;

            val.push(nr);
        }
        else
        {
            g = 1;

            if (!op.empty() && m[op.top()] >= m[sir[i]])
            {
                char o = op.top();
                op.pop();

                int a = val.top();
                val.pop();

                int b = val.top();
                val.pop();

                val.push(Calc(o, b, a));
            }

            op.push(sir[i]);
        }
    }

    while (!op.empty())
    {
        char o = op.top();
        op.pop();

        int a = val.top();
        val.pop();

        int b = val.top();
        val.pop();

        val.push(Calc(o, b, a));
    }

    fout << val.top();

    fin.close();
    fout.close();
    return 0;
}