HackerRank Grading Students

Grading Students

    /*
     * Complete the 'gradingStudents' function below.
     *
     * The function is expected to return an INTEGER_ARRAY.
     * The function accepts INTEGER_ARRAY grades as parameter.
     */

    public static List<int> gradingStudents(List<int> grades)
    {
        return grades.Select(grade=>{
             if(grade %5 < 3 || grade < 38){
                return grade;
            }
            return grade + (5 - grade %5); 
        }).ToList();
    }