using System;

public class Program

{

    public static void Main()

    {

        int i=0, n ,a,count=0;

        int [] arr = new int[50];

        Console.WriteLine("Enter the length of the array") ;

        n =int. Parse(Console. ReadLine ());

        Console.WriteLine("Enter the array of integers");

        for(i=0;i<n;i++)

        {

            arr[i]= int.Parse( Console. ReadLine ()) ;

        }

        for(i=0;i<n-2;i++)

        {

            if(arr[i]==1 && arr[i+1]==2 && arr[i+2]==3)

            {

                count+=1;

            }

        }

        if(count >0)

        {

            Console.WriteLine("True");

        }

        else

        {

            Console.WriteLine("False");

        }

    }

}