#include <iostream>
#include <fstream>
#include <string>
#include <stack>

using namespace std;

string str;
int i;
stack <int> result;
stack <char> ops;

ofstream out("evaluare.out");
bool is_digit (char c)
{
    if (c>=48 && c<=57)
        return true;
    return false;
}

bool is_operator (char c)
{
    if(c=='+'||c=='-'||c=='/'||c=='*')
        return true;
    return false;
}

int is_bracket (char c)
{
    if(c=='(')
        return -1;
    if(c==')')
        return 1;
    return 0;
}

int priority (char c)
{
    switch (c)
    {
        case '-': return 0;
        case '+': return 1;
        case '*': return 2;
        case '/': return 3;
    }
    return -1;
}

int comp(int a, int b, char c)
{
    out << b << c << a << "\n";
    /*switch (c)
    {
        case '+': cout << int(b+a);
        case '-': cout << int(b-a);
        case '/': cout << int(b/a);
        case '*': cout << int(b*a);
    }*/
    if(a==0&&c=='/')
        return 0;
    switch (c)
    {
        case '+': return (b+a);
        case '-': return (b-a);
        case '/': return (b/a);
        case '*': return (b*a);
    }
}

void pop_out()
{
    int a = result.top();
    result.pop();
    int b = result.top();
    result.pop();
    result.push(comp(a,b,ops.top()));
    ops.pop();
}

int main()
{
    ifstream in("evaluare.in");
    getline(in,str);
    in.close();
    int len = str.size();

    while(i<len)
    {
        if(is_digit(str[i]))
        {
            int temp = str[i]-48;
            ++i;
            while(is_digit(str[i]))
            {
                temp = temp*10+str[i]-48;
                ++i;
            }
            result.push(temp);
        }
        //cout <<is_bracket(str[i]) << " " << i << " " << str[i];
        if(is_bracket(str[i])<0)
        {
            ops.push('(');
            ++i;
        }
        if(is_operator(str[i]))
        {
            if(ops.empty())
                ops.push(str[i]);
            else
            {
                while (!ops.empty()&&priority(ops.top())>priority(str[i]))
                {
                    pop_out();
                }
                ops.push(str[i]);
            }
            //cout << ops.top();
            ++i;
        }
        if(is_bracket(str[i])>0)
        {
            while(ops.top()!='(')
            {
                pop_out();
            }
            ops.pop();
            ++i;
        }
    }
    //cout << result.size() << " " << ops.size() << " " << ops.top() << " " << result.top() << " ";
    while(!ops.empty())
    {

    }
    cout << result.top();

    return 0;
}