#include <iostream>
#include <cmath>
#include <string>
#include <list>
#include <vector>
#include <algorithm>
#include <stdexcept>
#include <conio.h>
#include <cstdlib>

using namespace std;

class Token {
public:
    char kind;
    double value;
    Token(char ch)
        :kind(ch), value(0) { }
    Token(char ch, double val)
        :kind(ch), value(val) { }
};

string ERROR(string str)
{
    cout << str;
    exit(0);
}

Token get_token()
{
    char ch;
    cin >> ch;
    switch (ch)
    {
        case '(': case ')': case '+': case '-': case '*': case '/':
            return Token(ch);
        case '.':
        case '0': case '1': case '2': case '3': case '4':
        case '5': case '6': case '7': case '8': case '9':
            {
                cin.putback(ch);
                double val;
                cin >> val;
                return Token('8',val);
            }
        default:
            ERROR("Bad token");
    }
}

double expression();
double term();

double primary()
{
    Token t = get_token();
    switch (t.kind)
    {
        case '(':
            {
                double d = expression();
                t = get_token();
                if (t.kind != ')')ERROR("')' expected");
                return d;
            }
        case '8':
            return t.value;
        default:
            ERROR("primary expected");
    }
}

double term()
{
    double left = primary();
    Token t = get_token();
    while(true)
    {
        switch (t.kind)
        {
            case '*':
                left *= primary();
                t = get_token();
                break;
            case '/':
                {
                    double d = primary();
                    if (d == 0) ERROR("divide by zero");
                    left /= d;
                    t = get_token();
                    break;
                }
            default:
                return left;
        }
    }
}

double expression()
{
    double left = term();
    Token t = get_token();
    while(true)
    {
        switch(t.kind)
        {
            case '+':
                left += term();
                t = get_token();
                break;
            case '-':
                left -= term();
                t = get_token();
                break;
            default:
                return left;
        }
    }
};

int main()
{
    try
    {
        while (cin)
            cout << expression() << '\n';
        //keep_window_open("~0");
    }
    catch (exception& e)
    {
        cerr << e.what() << endl;
        //keep_window_open ("~1");
        return 1;
    }
    catch (...)
    {
        cerr << "exception \n";
        //keep_window_open ("~2");
        return 2;
    }
}