using System.Collections.Generic;
using System.Threading.Tasks;
public static void Main(string[]args)
string str = Console.ReadLine();
double x = Convert.ToDouble(str);
string o= Console.ReadLine();
char op= Convert.ToChar(o);
double y = Convert.ToDouble(Console.ReadLine());
Console.WriteLine(" = {0}", sum);
Console.WriteLine(" = {0}", dif);
Console.WriteLine(" = {0}", prod);
Console.WriteLine(" = {0}", quo);