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    Python Solution:`

        result = []
        for grade in grades:
            if(grade<38):
                result.append(grade)
            else:
                next_mutliple = grade-(grade%5)+5
                if (next_mutliple-grade<3):
                    grade=next_mutliple
                    result.append(grade)
                else:
                    result.append(grade)          
            
        return result