Codility Sigma 2012

using System;
using System.Collections.Generic;

class Solution
{
    public int stone_wall(int[] H)
    {
        var stoneStorage = new Stack<int>();
        var stoneCount = 1;
        var currentStoneHeight = H[0];
        for (var currentPosition = 1; currentPosition < H.Length; currentPosition++)
        {
            var currentHeight = H[currentPosition];
            if (currentHeight > currentStoneHeight)
            {
                stoneCount++;
                stoneStorage.Push(currentStoneHeight);
                currentStoneHeight = currentHeight;
            }
            else if (currentHeight < currentStoneHeight)
            {
                while (stoneStorage.Count > 0 && stoneStorage.Peek() >= currentHeight)
                {
                    currentStoneHeight = stoneStorage.Pop();
                }

                if (currentHeight < currentStoneHeight)
                {
                    stoneCount++;
                    currentStoneHeight = currentHeight;
                }
            }
        }
        return stoneCount;
    }
}