using System;

public class Program

{

​

    public static void Main()

    {

        /*

        int x = 100;

​

        for(int i = 0; i < 20; i++) {

        x = x + 1;

        Console.WriteLine(i);

    }

​

Console.WriteLine("x: "+ x);

        */

int x = 100;

int i = 0;

​

while( i < 20) 

    {

    x = x + 1;

    Console.WriteLine(i);

    i = i + 1;

    }

​

    Console.WriteLine("x: "+ x);

    }

}