function gradingStudents(grades) {
    // less than 38 is automatically failed
    // if the difference b/w original marks and rounded original marks by closest multiple of 5
    // is less than 3, then round off to rounded marks. If not, original marks remain the same.
    let minMarks = 38;
    let lengthOfGrades = grades.length;
    let finalArray = [];
    let mult5 = 0;
    console.log(grades);
    // assuming grades -> [73,67,38,33]
    for(let i = 0; i < lengthOfGrades; i++ ){
        // fail because grades LT 38
        if( grades[i] < minMarks ){
            finalArray.push(grades[i]);
        }else {
            // grades are GTE 38
            // finding the multiples of 5
            mult5 = Math.ceil(grades[i]/5); // 73/5 => 14.6 => ceil(14.6) => 15
            mult5 *= 5; // to get the multiple of 5 closest to grade 15*5=>75
            if( mult5 - grades[i] < 3 ){
                finalArray.push(mult5);
            }else{
                finalArray.push(grades[i]);
            }
        }
    } 
    return finalArray;
}