static int[] values = new int[2];

public static int[] getValue()
        {
            bool tryAgain;

            do
            {
                string line = Console.ReadLine();
                string[] svals = line.Split(new char[] { ':' });
                tryAgain = false;

                for (int i = 0; i <= values.Length; i++)
                {
                    try
                    {
                        values[i] = Int16.Parse(svals[i]);
                    }
                    catch { continue; }
                }

            } while (tryAgain);
            return values;
        }

public int conversion1()
        {
            int score= values[0];
            int book= values[1]

            //reszta programu
        }