using System;

using System.Collections.Generic;

​

public class Program

{

    public static void Main()

    {

        var transformationOne = new TransformationOne();

​

        var inputs = new List<int> { 1, 2, 1, 0, 3, 2 };

​

        foreach (var input in inputs)

        {

            var newResult = transformationOne.Calculate(input);

            Console.WriteLine(newResult); // results: 1 3 4 4 7 9

        }

    }

​

    class TransformationOne

    {

        private int _currentResult;

​

        public int Calculate(int value)

        {

            _currentResult += value;

            return _currentResult;

        }

    }

}