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import java.io.*;
import java.math.*;
import java.security.*;
import java.text.*;
import java.util.*;
import java.util.concurrent.*;
import java.util.regex.*;

class Result {

    /*
     * Complete the 'pickingNumbers' function below.
     *
     * The function is expected to return an INTEGER.
     * The function accepts INTEGER_ARRAY a as parameter.
     */

    public static int pickingNumbers(List<Integer> a) {
        int max=0;
    Collections.sort(a);

    for (int i = 0; i < a.size() - 1; i++) {
        int count = 1;
        for (int j = i + 1; j < a.size(); j++) {

            if (Math.abs(a.get(i) - a.get(j)) <= 1) {

                count++;

            }
            if (count > max) {
            max = count;
        }

        }
    }
  return max;

}
}

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 n = Integer.parseInt(bufferedReader.readLine().trim());

        String[] aTemp = bufferedReader.readLine().replaceAll("\\s+$", "").split(" ");

        List<Integer> a = new ArrayList<>();

        for (int i = 0; i < n; i++) {
            int aItem = Integer.parseInt(aTemp[i]);
            a.add(aItem);
        }

        int result = Result.pickingNumbers(a);

        bufferedWriter.write(String.valueOf(result));
        bufferedWriter.newLine();

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

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