import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;

/**
 * @author Jan Buchar
 */
public class CodEx
{
    private static String line;

    private static int cursor;

    public static void main (String[] args)
    {
        BufferedReader reader = new BufferedReader(new InputStreamReader(System.in));

        try {
            while ((line = reader.readLine()) != null) {
                if (isEmpty(line)) {
                    continue;
                }

                try {
                    System.out.printf("%.5f\n", eval(line));
                } catch (Exception e) {
                    System.out.println("ERROR");
                }
            }
        } catch (IOException e) {
            System.out.println("ERROR");
        }
    }

    private static boolean isEmpty (String line)
    {
        for (char ch: line.toCharArray()) {
            if (!Character.isWhitespace(ch)) {
                return false;
            }
        }

        return true;
    }

    private static void next ()
    {
        do {
            cursor++;
        } while (current() != 0 && Character.isWhitespace(current()));
    }

    private static char current ()
    {
        if (cursor >= line.length()) {
            return 0;
        }

        return line.charAt(cursor);
    }

    private static double eval (String line) throws Exception
    {
        cursor = -1;
        next();
        return sub();
    }

    private static double sub () throws Exception
    {
        double result = add();

        while (current() == '-') {
            next();
            result -= add();
        }

        return result;
    }

    private static double add () throws Exception
    {
        double result = div();

        while (current() == '+') {
            next();
            result += div();
        }

        return result;
    }

    private static double div () throws Exception
    {
        double result = mul();

        while (current() == '/') {
            next();
            result /= mul();
        }

        return result;
    }

    private static double mul () throws Exception
    {
        double result = val();

        while (current() == '*') {
            next();
            result *= val();
        }

        return result;
    }

    private static double val () throws Exception
    {
        if (current() == '(') {
            next();
            double result = sub();

            if (current() != ')') {
                throw new Exception();
            }

            next();
            return result;
        }

        StringBuilder builder = new StringBuilder();

        do {
            builder.append(current());
            cursor++;
        } while (current() != '+'
                && current() != '-'
                && current() != '*'
                && current() != '/'
                && current() != '('
                && current() != ')'
                && current() != 0
        );

        String number = builder.toString();

        if (isEmpty(number)) {
            throw new Exception();
        }

        try {
            return Double.parseDouble(number);
        } catch (NumberFormatException e) {
            throw new Exception();
        }
    }
}