1va

static void Main(string[] args)
        {
            Dictionary<string, int> uredi = new Dictionary<string, int>();
            uredi.Add("treadmill", 5899);
            uredi.Add("cross trainer", 1699);
            uredi.Add("dumbbells", 579);
            uredi.Add("exercise bike", 1789);

            int n = int.Parse(Console.ReadLine());
            int sum = 0;

            string input = "";
            for (int i = 0; i < n; i++)
            {
                input = Console.ReadLine();
                if (uredi.ContainsKey(input))
                {
                    sum += uredi[input];
                }
            }
            Console.WriteLine($"sum:f2");
        }