using System;
public class Program
{
public static void Main()
double sm = 9;
double sm1 = 9;
double SmInch = 9 * 0.3937;
Console.WriteLine(SmInch);
Console.WriteLine(" ");
double inch = 9;
double Myas = inch * 2.54;
Console.WriteLine(Myas);
double a = 10;
double b = 11;
double s = (a + b) / 2;
Console.WriteLine(s);
}