Acivity Tracker

import java.text.ParseException;
import java.time.LocalDate;
import java.time.format.DateTimeFormatter;
import java.util.ArrayList;
import java.util.Map;
import java.util.Scanner;
import java.util.TreeMap;


public class ActivityTracker {


    public static void main(String[] args) throws ParseException {
        Scanner input = new Scanner(System.in);
        int n = input.nextInt();
        input.nextLine();
        ArrayList<String[]> inputInfos = new ArrayList<>();
        for (int i = 0; i < n; i++){
            inputInfos.add(input.nextLine().split("[\\s]+"));
        }
        Map<String,String> tracker = new TreeMap<>();
        for (int i = 0; i < inputInfos.size(); i++){
            String[] tempInfo = inputInfos.get(i);
            String dateString = tempInfo[0];
            DateTimeFormatter formatter = DateTimeFormatter.ofPattern("dd/MM/yyyy");
            LocalDate date = LocalDate.parse(dateString, formatter);
            String month = Integer.toString(date.getMonthValue());
            String name = tempInfo[1];
            String distance = tempInfo[2];
            if (tracker.containsKey(month)){
                String old = tracker.get(month);
                tracker.put(month, old+name+" "+distance+", ");
            }
            else {
                tracker.put(month, name+" "+distance+", ");
            }
        }
        for(Map.Entry<String,String> entry : tracker.entrySet()) {
            String month = entry.getKey();
            String namesDistances = entry.getValue();
            String[] temporary = namesDistances.split("[\\s\\', ']+");
            Map<String,Integer> monthValues = new TreeMap<>();
            for (int i = 0; i < temporary.length; i+=2){
                if (monthValues.containsKey(temporary[i])){
                    int oldValue = monthValues.get(temporary[i]);
                    monthValues.put(temporary[i], oldValue+Integer.parseInt(temporary[i+1]));
                }
                else{
                    monthValues.put(temporary[i], Integer.parseInt(temporary[i+1]));
                }
            }
            System.out.printf("%s: ",month);
            int count = 0;
            int size = monthValues.size();
            for(Map.Entry<String,Integer> entra : monthValues.entrySet()) {
                count++;
                String key = entra.getKey();
                Integer value = entra.getValue();
                if (count == size){
                    System.out.printf("%s(%d)",key,value);
                }
                else{
                    System.out.printf("%s(%d), ",key,value);
                }
            }
            System.out.println();
        }
    }
}