GiftboxCoverage

using System;

namespace GiftboxCoverage
{
    class MainClass
    {
        public static void Main(string[] args)
        {
            double sizeOfBoxSide = double.Parse(Console.ReadLine());
            int allSheetsOfPaper = int.Parse(Console.ReadLine());
            double areaCoveredBySingleNormalSheet = double.Parse(Console.ReadLine());
            double areaCoveredByEveryThirdSheet = 0.25 * areaCoveredBySingleNormalSheet;
            double numberOfEveryThirdSheet = Math.Truncate((double)allSheetsOfPaper / 3);
            double numberOfEveryNormalSheet = allSheetsOfPaper - numberOfEveryThirdSheet;
            double areaCoveredWithAllSheets = (numberOfEveryNormalSheet * areaCoveredBySingleNormalSheet) + (numberOfEveryThirdSheet * areaCoveredByEveryThirdSheet);

            double areaOfGiftBox = sizeOfBoxSide * sizeOfBoxSide*6;
            double percentageAllSheetsCovered = areaCoveredWithAllSheets / areaOfGiftBox * 100;
            Console.WriteLine($"You can cover {percentageAllSheetsCovered:F2}% of the box.");
        }
      }
    }