public static List<Integer> gradingStudents(List<Integer> grades) {
    List<Integer> gradesPlus = new ArrayList<>();
    for (Integer grade : grades) {
        if (grade >= 38 && grade % 5 >= 3){
            grade = grade + 5-grade % 5;          
        }
        gradesPlus.add(grade);
}
    return gradesPlus;
    }