Something

            int iAdmited = 50;
            System.Collections.ArrayList objArrayList = new System.Collections.ArrayList();

            objArrayList.Add(12);
            objArrayList.Add(15);
            objArrayList.Add(20);
            objArrayList.Add(25);
            objArrayList.Add(30);
            objArrayList.Add(35);
            objArrayList.Add(40);
            objArrayList.Add(45);
            objArrayList.Add(55);
            objArrayList.Add(60);

            System.Collections.ArrayList objValue = new System.Collections.ArrayList();
            // loop through the given values
            foreach (int objInt in objArrayList)
            {
                if (objInt <= iAdmited)
                {
                    // add the values under 50 to our arraylist so that we can use it later
                    objValue.Add(objInt);

                }
            }
            int iValueEnd = 0;
            // loop throught the collection of values under 50
            foreach (int iValue in objValue)
            {
                
                if (iValueEnd < iAdmited)
                {

                    // add the value
                    iValueEnd = iValueEnd + iValue;

                    // if the value added makes the end result heigher then 50 it will be removed
                    if (iValueEnd >= iAdmited)
                    {
                        iValueEnd = iValueEnd - iValue;
                    }
                }
            }

            /// End Result will be 47
            MessageBox.Show(iValueEnd.ToString());