using System;

public class Program

{

    public static void Main()

    {

        Console.WriteLine("int 3digit number");

        int ed;

        if (n>=100 && n<=999)

 ed=n%10;

 if (ed>=0 && ed<=2)

 {

 Console.WriteLine("ДА");

 }

 else

 {

 if (ed>=5 && ed<=9)

 {

 Console.WriteLine("ДА");

 }

 else

 {

 Console.WriteLine("НЕ");

 }

}