ceiling an integer in C#

hi,
try this:

sample:

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace ConsoleApplication1
{
    class Class2
    {
        static void Main(string[] args)
        {
            Console.WriteLine("Enter a number");
            int numberFloor = Convert.ToInt32(Console.ReadLine());
            decimal a = (decimal)numberFloor / 3;           
            decimal res = Math.Round(a);
            int heightGroupBox = ((Convert.ToInt32(res)* 25) + 30);          
            Console.WriteLine(heightGroupBox);
            Console.ReadKey();

        }
    }
}


if you want to write it in a single line try this:

int heightGroupBox = ((Convert.ToInt32(Math.Round((decimal)numberFloor / 3)) * 25) + 30);