using System;

public class Program

{

    public static void Main(string[] args)

    {

        int a=11;

        int b=20;

        if (a==10) 

        {

            if (b==20) 

            {

                Console. WriteLine ("value of a is 10 and b is 20") ;

            }

        }

        Console. ReadLine() ;

    }

}