static int[] solve(int[] grades)
        {            
            int[] res = new int[grades.Length];
            for (int i = 0; i < grades.Length; i++)
            {
                if (grades[i] % 5 > 2 && !(grades[i] < 38))              
                    res[i] = grades[i] + (5-grades[i]%5);                               
                else               
                    res[i] = grades[i];
               
            }
            return res;
        }