int NextMultipleOfFive(int n)
{
    return (((100 - n) % 5) + n);
}

vector<int> gradingStudents(vector<int> grades) {
    for(int i = 0; i < grades.size(); ++i)
    {
        if(38 > grades[i])
        {
            continue;
        }
        else
        {
            int round = NextMultipleOfFive(grades[i]);
            if( 3 > (round - grades[i]))
            {
                grades[i] = round;
            }
        }
    }
    return grades;
}