MultiDict01Average Student Grades

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

namespace MultiDictionaries
{
    class Program
    {
        static void Main(string[] args)
        {
            var grades = new Dictionary<string, List<double>>();
            int n = int.Parse(Console.ReadLine());

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

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

            foreach(var pair in grades)
            {
                string name = pair.Key;
                var studentGrades = pair.Value;
                var average = studentGrades.Average();

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

                foreach(var grade in studentGrades)
                {
                    Console.Write($"{grade:f2} ");
                }
                Console.WriteLine($"(avg: {average:f2})");

            }

        }
    }
}