private static void Main()
        {
            List<Item> knapsackItems = new List<Item>();
            knapsackItems.Add(new Item
            {
                Name = "beer",
                Weight = 3,
                Value = 2,
            });

            knapsackItems.Add(new Item
            {
                Name = "vodka",
                Weight = 8,
                Value = 12,
            });

            knapsackItems.Add(new Item
            {
                Name = "cheese",
                Weight = 4,
                Value = 5,
            });

            knapsackItems.Add(new Item
            {
                Name = "nuts",
                Weight = 1,
                Value = 4,
            });

            knapsackItems.Add(new Item
            {
                Name = "ham",
                Weight = 2,
                Value = 3,
            });

            knapsackItems.Add(new Item
            {
                Name = "whiskey",
                Weight = 8,
                Value = 13,
            });

            var bag = new Knapsack(10);
            bag.Calculate(knapsackItems);
            bag.All(x => { Console.WriteLine(x); return true; });
            Console.WriteLine("Max weight: " + bag.Sum(x => x.Weight));
            Console.WriteLine("Max value: " + bag.Sum(x => x.Value));
        }