#include <stdlib.h>
#include <iostream>
#include <sstream>

using namespace std;

double solve(string equation);

int main() {
    string equation;
    while (true) {
        cout << "Equation(no spaces): ";
        getline(cin, equation);
        cout << solve(equation) << endl;
    }
}

double solve(string equation) {
    //cout << equation << endl;
    if (equation.length() == 1) return atof(equation.c_str());
    double number;
    if (equation.substr(0,1) == "(") {
        return solve(equation.substr(1,equation.find_last_of(')',equation.length())-1));
    } else {
        number = atof(equation.substr(0,1).c_str());
        double number2 = solve(equation.substr(2,equation.length()-1));
        switch (equation[1]) {
        case '+':
            return number+number2;
        case '-':
            return number-number2;
        case '/':
            return number/number2;
        case '*':
            return number*number2;
        }
    }
}