Activity Tracker

using System;
using System.Collections.Generic;
using System.Text;

public class ActivityTracker
{
    public static void Main()
    {
        int countOfEntries = int.Parse(Console.ReadLine());

        var trackerData = new SortedDictionary<int, SortedDictionary<string, int>>();

        for (int i = 0; i < countOfEntries; i++)
        {
            string[] inputParams = Console.ReadLine().Split();

            int month = int.Parse(inputParams[0].Split('/')[1]);
            string name = inputParams[1];
            int distance = int.Parse(inputParams[2]);

            if (!trackerData.ContainsKey(month))
            {
                trackerData.Add(month, new SortedDictionary<string, int>());
            }

            if (!trackerData[month].ContainsKey(name))
            {
                trackerData[month].Add(name, 0);
            }

            trackerData[month][name] += distance;
        }

        StringBuilder output = new StringBuilder();

        foreach (var monthData in trackerData)
        {
            output.AppendFormat("{0}: ", monthData.Key);

            int index = 0;
            foreach (var keyValuePair in monthData.Value)
            {
                output.AppendFormat("{0}({1})", keyValuePair.Key, keyValuePair.Value);

                if (index < monthData.Value.Count - 1)
                {
                    output.Append(", ");
                }

                index++;
            }

            output.AppendLine();
        }

        Console.WriteLine(output);
    }
}