Sets & Dictionaries Advanced - 2. Average Student Grades

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

namespace Advanced
{
    class Program
    {
        static void Main(string[] args)
        {
            int number = int.Parse(Console.ReadLine());

            var studentsGrades = new Dictionary<string, List<double>>();

            for (int i = 0; i < number; i++)
            {
                var input = Console.ReadLine().Split();
                var name = input[0];
                var grade = double.Parse(input[1]);

                if (!studentsGrades.ContainsKey(name))
                {
                    studentsGrades[name] = new List<double>();
                }

                studentsGrades[name].Add(grade);
            }

            foreach (var student in studentsGrades)
            {
                var name = student.Key;
                var grades = student.Value;
                var average = grades.Average();

                Console.Write($"{name} -> ");

                foreach (var grade in grades)
                {
                    Console.Write($"{grade:f2} ");
                }

                Console.WriteLine($"(avg: {average:f2})");
            }
        }
    }
}