Hi guys I wrote a code but I need to do it simpler

namespace B2Task
{
    internal class Program
    {
        static void Main(string[] args)
        {
            Console.WriteLine("Give a number of days");
            int N = Convert.ToInt32(Console.ReadLine());
            Console.WriteLine("Give a number of temperature");
            int K = Convert.ToInt32(Console.ReadLine());
            int i = 0;
            int[] arr;
            arr = new int[N];
            while (1 > N || N > 100 || K < 20 || K > 30) ;
            while (i < N)
            {
                Console.WriteLine("day{0}", i + 1);
                arr[i] = Convert.ToInt32(Console.ReadLine());
                while (arr[i] > 40 || arr[i] < 0) ;
                i++;
            }
            int x = 0;
            Console.WriteLine("The number of days with highest temperature");
            for (i = 0; i < N; i++)
            {
                if (arr[i] > K)
                {
                    x++;
                }
            }
            Console.WriteLine(x);
            Console.WriteLine("Days with the highest temp");
            for (i=0; i < N; i++)
            {
                if (arr[i] > K)
                {
                    Console.WriteLine(i+1);
                }
             }
        }
    }
}

namespace B2Task
{
    internal class Program
    {
        static void Main(string[] args)
        {
            Console.WriteLine("Give a number of days");
            int N = Convert.ToInt32(Console.ReadLine());
            Console.WriteLine("Give a number of temperature");
            int K = Convert.ToInt32(Console.ReadLine());
            int i = 0;
            int[] arr;
            arr = new int[N];
            while (1 > N || N > 100 || K < 20 || K > 30) ;
            while (i < N)
            {
                Console.WriteLine("day{0}", i + 1);
                arr[i] = Convert.ToInt32(Console.ReadLine());
                while (arr[i] > 40 || arr[i] < 0) ;
                i++;
            }
            int x = 0;
            Console.WriteLine("The number of days with highest temperature");
            for (i = 0; i < N; i++)
            {
                if (arr[i] > K)
                {
                    x++;
                }
            }
            Console.WriteLine(x);
            Console.WriteLine("Days with the highest temp");
            for (i=0; i < N; i++)
            {
                if (arr[i] > K)
                {
                    Console.WriteLine(i+1);
                }
             }
        }
    }
}