Среден успех

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using System;

namespace sredenuspeh
{
    class Program
        {
            static void Main(string[] args)
            {
                string[] students = { "Васил", "Даниел", "Божидарда" };
                string[] subjects = { "БЕЛ", "МАТ", "ИТ" };
                int[,] marks = new int[students.Length, subjects.Length];

                for (int i = 0; i < students.Length; i++)
                {
                    Console.WriteLine("Въведи оценки за " + students[i]);
                    for (int j = 0; j < students.Length; j++)
                    {
                        Console.Write(subjects[j] + ": ");
                        marks[i, j] = int.Parse(Console.ReadLine());
                    }

                }
                for (int j = 0; j < subjects.Length; j++)
                {
                    int sum = 0;
                    for (int i = 0; i < students.Length; i++)
                    {
                        sum += marks[i, j];
                    }
                    Console.WriteLine("Среден успех по {0} {1:f2}", subjects[0], (double)sum / students.Length);
                }
            }
        }
    }