Grading Students(HackerRank)

import java.io.*;
import java.math.*;
import java.security.*;
import java.text.*;
import java.util.*;
import java.util.concurrent.*;
import java.util.function.*;
import java.util.regex.*;
import java.util.stream.*;
import static java.util.stream.Collectors.joining;
import static java.util.stream.Collectors.toList;

class Result {

    /*
     * Complete the 'gradingStudents' function below.
     *
     * The function is expected to return an INTEGER_ARRAY.
     * The function accepts INTEGER_ARRAY grades as parameter.
     */

    public static List<Integer> gradingStudents(List<Integer> grades) 
    {
    // Write your code here

        List<Integer> list = new ArrayList<>();
        for(int i=0;i<grades.size();i++)
        {
            if(grades.get(i) < 38 && grades.get(i) >= 0)
            {
                list.add(grades.get(i));
                continue;
            }
            else
            {
                int a = grades.get(i);
                while(a%5 != 0)
                {
                    a++;
                }
                int diff = a-grades.get(i);
                if(diff<3)
                {
                    list.add(a);
                }else
                {
                    list.add(grades.get(i));
                }
            }
        }
        return list;
    }

}

public class Solution {
    public static void main(String[] args) throws IOException {
        BufferedReader bufferedReader = new BufferedReader(new InputStreamReader(System.in));
        BufferedWriter bufferedWriter = new BufferedWriter(new FileWriter(System.getenv("OUTPUT_PATH")));

        int gradesCount = Integer.parseInt(bufferedReader.readLine().trim());

        List<Integer> grades = IntStream.range(0, gradesCount).mapToObj(i -> {
            try {
                return bufferedReader.readLine().replaceAll("\\s+$", "");
            } catch (IOException ex) {
                throw new RuntimeException(ex);
            }
        })
            .map(String::trim)
            .map(Integer::parseInt)
            .collect(toList());

        List<Integer> result = Result.gradingStudents(grades);

        bufferedWriter.write(
            result.stream()
                .map(Object::toString)
                .collect(joining("\n"))
            + "\n"
        );

        bufferedReader.close();
        bufferedWriter.close();
    }
}