function gradingStudents(grades: number[]): number[] {
    const roundedGrades: number[] = [];
    const length = grades.length;
    
    for (let i = 0; i < length; i++) {
        const grade = grades[i];
        const nextMultipleOf5 = grades[i] + (5 - (grades[i] % 5));
        if (grade < 38) {
            roundedGrades.push(grade);
        } else if (nextMultipleOf5 - grade < 3) {
            roundedGrades.push(nextMultipleOf5);
        } else {
            roundedGrades.push(grade);
        }
    }
    
    return roundedGrades;
}