vector<int> gradingStudents(vector<int> grades)
{
    for(int i = 0; i < grades.size(); i++)
    {
        if(grades[i] >= 38)
        {
            int diff = abs((grades[i]%5)-5);
            if(diff < 3)
            {
                grades[i] += diff;
            }
        }
    }
    return grades;
}