/* -------- With C# -------- */

public static List<int> gradingStudents(List<int> grades)
{
    List<int> newGrade =new List<int>();

    foreach(var grade in grades)
    {
        if(grade < 38) newGrade.Add(grade);

        else if(grade >=38)
        {
            int testN = 0;
            testN =((grade + 4)/5) * 5 ;

            if((testN - grade) <3)
            {
                newGrade.Add(testN);
            }
            else
            {
                newGrade.Add(grade);
            }
        }  
    }
    return newGrade;
}