Five Integers Check if Int (Exercise)

using System;
using System.Collections.Generic;
using System.Linq;

namespace ConsoleTesting
{
    class ConsoleTesting
    {
        static void Main()
        {
            List<int> nums = new List<int>();
            Console.WriteLine("Enter five valid integers:");
            for (int i = 0; i < 5; )
            {
                Console.Write((i + 1) + ". ");
                int temp;
                bool isInt = int.TryParse(Console.ReadLine(), out temp);
                if (isInt == false)
                {
                    Console.WriteLine("Not a valid integer. Try again:");
                }
                else
                {
                    nums.Add(temp);
                    i++;
                }
            }
            Console.WriteLine("Sum: " + nums.Sum());
        }
    }
}