static void Main(string[] args)
        {
            // Write an expression that checks if given positive integer number n (n = 100) is prime (i.e. it is divisible without remainder only to itself and 1).
            int n = 0;
            do
            {
                Console.WriteLine("Input a positive integer:");
                n = int.Parse(Console.ReadLine());
            }
            while (n <= 1);
            bool prime = true;
           if ((n % n == 0) && (n % 1 == 0))

            {
                Console.WriteLine(prime);
            }
            else
            {
                Console.WriteLine(!prime);
            }

        }