using System;
using System.Collections.Generic;
public class Program
{
public static void Main()
/*int a = 2, b = 3;
switch(2 * a + b)
case 2:
Console.WriteLine("Hello!");
break;
case 3:
Console.WriteLine("Hi :)");
default:
Console.WriteLine("Good bye!");
case 7:
Console.WriteLine("Sorry!");
}*/
/*int m = 23120;
string str = m.ToString();
char a = str[1];
char b = str[2];
Console.WriteLine((a - '0') + (b - '0'));*/
/*int k = 5;
int x = 20;
do
x += k;
k *= 2;
}
while(k < 20);
Console.WriteLine(x);*/
/*int[] arr = {101, -5, 13, 44, 9};
Array.Reverse(arr);
int b = arr[1] + arr[arr.Length - 2];
Console.WriteLine(b);*/
/*List<int> myList = new List<int>{12, 3, 33, 3, 13, 29, 12, 29, 4};
List<int> secondList = new List<int>();
foreach(int n in myList)
if(!secondList.Contains(n)) secondList.Add(n);
Console.WriteLine(secondList.Count);*/
/*string[] names = {"Варна", "Айтос", "Бургас", "Аврен"};
List<string> nmList = new List<string>();
nmList.AddRange(names);
nmList.InsertRange(2, names);
nmList.RemoveAt(4);
Console.WriteLine(nmList[4]);*/
