PriyankaAndToys.java

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

public class PriyankaAndToys {
//	https://www.hackerrank.com/challenges/priyanka-and-toys/problem
    // Complete the toys function below.
    static int toys(int[] w) {
               Arrays.sort(w);
        int minWeight = w[0]+4;
        int containerCount = 1;
        for(int i = 0; i<w.length;i++) {
            if(w[i]>minWeight) {
                containerCount++;
                minWeight = w[i]+4;
            }
        }
        return containerCount;

    }

    private static final Scanner scanner = new Scanner(System.in);

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

        int n = scanner.nextInt();
        scanner.skip("(\r\n|[\n\r\u2028\u2029\u0085])?");

        int[] w = new int[n];

        String[] wItems = scanner.nextLine().split(" ");
        scanner.skip("(\r\n|[\n\r\u2028\u2029\u0085])?");

        for (int i = 0; i < n; i++) {
            int wItem = Integer.parseInt(wItems[i]);
            w[i] = wItem;
        }

        int result = toys(w);

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

        bufferedWriter.close();

        scanner.close();
    }
}