using System;
public class Program
{
public static void Main()
//ramon ramos
int num;
Console.WriteLine("Write a number From 1-20");
num = int.Parse(Console.ReadLine());
if ( num > 20 || num < 1)
Console.WriteLine("the numbe is out of range");
}
else if (num % 2 == 0)
num++;
Console.WriteLine(num);
else if (num % 2 != 0)