using System;

using System.Collections.Generic;

using System.Linq;

public class Program

{

    public static void Main()

    {

        var height = new int[]{0,1, 0, 4,2,3};

        var lastJ =0;

        int result = 0;

        for(int i = 0; i<height.Length;i++) {

            if (height[i] == 0 || (lastJ > i)) continue;

            Console.WriteLine(i);

            var maxFromRest = 0;

            for(int j =i+1; j < height.Length;j++){

                if(height[j]>maxFromRest) maxFromRest = height[j];

            }

            for(int j =i+1; j < height.Length;j++){

               if(height[j] >= height[i] || height[j] == maxFromRest) {

                   lastJ = j;

                   var min = Math.Min(height[i], height[j]);

                   var subRes = 0;

                   Console.WriteLine("mm  " + i + " ii "+ j);

                   for(var k = i+1; k<j; k++){

                     if(height[k] <= min) subRes += min - height[k];

                   }

                   result+=subRes;

                   break;

               }

            }

        }

        Console.WriteLine("r  "+result);

    }

}