Map.java

import java.util.*;

public class maps_lecture_ex1 {
    public static void main(String[] args) {
        Scanner scan = new Scanner(System.in);

        double[] numbers = Arrays.stream(scan.nextLine().split(" ")).mapToDouble(Double::parseDouble).toArray();

        Map<Double, Integer> numbersCount = new TreeMap<>();

        for(double number : numbers) {
            if(!numbersCount.containsKey(number)) {
                numbersCount.put(number, 1);
            }
            else {
                int currentCount = numbersCount.get(number);  //br sreshtaniq
                numbersCount.put(number, currentCount + 1);
            }
        }

        //print
        for(Map.Entry<Double, Integer> entry : numbersCount.entrySet()) {
            System.out.printf("%.0f -> %d%n", entry.getKey(), entry.getValue());
        }
    }
}