using System;

public class Program

{

    public static void Main()

    {

        Console.WriteLine("Enter a number, operator, number");

        double n1=double.Parse(Console.ReadLine());

        char op=char.Parse(Console.ReadLine());

        double n2=double.Parse(Console.ReadLine());

        double ans=0;

        int error=1;

        switch (op)

        {

            case '+':

                ans=n1+n2;

                break;

            case '-':

                ans=n1-n2;

                break;

            case '/':

                ans=n1/n2;

                break;

            case '*':

                ans=n1*n2;

                break;

            default:

                error=2;

                Console.WriteLine("ERROR");

                break;

        }

        if (error==1)

            Console.WriteLine("{0} {1} {2} = {3}",n1,op,n2,ans);

    }

}