using System;
public class Kata
{
  public static double Calculator(double a, double b, char op)
  {
    double x = a;
    double y = b;
    char user = op;
    double result = 0;
  	if(user == "+")
			{
			result = x + y;
			return result;
			}
			else

			if(user == "-")
			{
			result = x - y;
			return result;
			}
			else

			if (user == "*")
			{
			result = x * y;
		return result;
			}
			else

			if (user ==  "/")

			{result = x / y;
			return result;

			}


  }
}