using System;
using System.Collections.Generic;

namespace calculator {
    class Calculator {
        public Calculator() { }

        public void Run() {
            Queue<string> queue = new Queue<string>();

            while (true) {
                string input = Console.ReadLine();

                if (input == "=") {
                    break;
                } else {
                    queue.Enqueue(input);
                }
            }

            Console.WriteLine("Calculating!!!");

            double res = 0.0;
            string operatorMode = "+";

            while (queue.Count != 0) {
                string current = queue.Dequeue();

                switch (current) {
                    case "+":
                    case "-":
                    case "*":
                    case "/":
                        operatorMode = current;
                        break;
                    default:
                        res = Operate(res, current, operatorMode);
                        break;
                }
            }

            Console.WriteLine(res);
        }

        static double Operate(double res, string current, string operatorMode) {
            try {
                double num = double.Parse(current);
                switch (operatorMode) {
                    case "+":
                        res += num;
                        break;
                    case "-":
                        res -= num;
                        break;
                    case "*":
                        res *= num;
                        break;
                    case "/":
                        res /= num;
                        break;
                }
            } catch (Exception ex) {
                Console.WriteLine("Unknown char: " + current);
            }

            return res;
        }
    }

    class MainClass {
        public static void Main(string[] args) {
            Calculator calc = new Calculator();
            calc.Run();
        }
    }
}