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

namespace Task2
{
    class Program
    {
        class Student
        {
            public string name;
            public int group;
            public byte[] marks;

            public Student( string name, int group, byte[] marks)
            {
                this.name = name;
                this.group = group;
                this.marks = marks;
            }
        }

        class Mark
        {
            public int group;
            public int number;
            public int sum;

            public Mark(int group, int number, int sum)
            {
                this.group = group;
                this.number = number;
                this.sum = sum;
            }
        }

        static void Main(string[] args)
        {
            List<Student> Students = new List<Student>();

            Students.Add(new Student("Karuch", 1, new byte[] { 5, 5, 5 }));
            Students.Add(new Student("Orlova",2, new byte[] { 5, 3, 2 } ));
            Students.Add(new Student("Dudkina", 3, new byte[] { 2, 2, 4 }));
            Students.Add(new Student("Kozlovski", 1, new byte[] { 2, 2, 2 } ));
            Students.Add(new Student("Grenaderov", 2,new byte[] { 3, 3, 5 } ));
            Students.Add(new Student("Babak", 3, new byte[] { 3, 3, 4 } ));
            Students.Add(new Student("Kurochkin", 1, new byte[] { 1, 2, 2 }));

            FileStream fs = new FileStream("task2", FileMode.OpenOrCreate, FileAccess.Write);
            BinaryWriter bw = new BinaryWriter(fs);
            foreach (Student i in Students)
            {
                bw.Write(i.name);
                bw.Write(i.group);
                bw.Write(i.marks);
            }
            bw.Close();
            fs.Close();

            FileStream second_fs = new FileStream("task2", FileMode.OpenOrCreate, FileAccess.Read);
            BinaryReader br = new BinaryReader(second_fs);

            List<Student> EndStudents = new List<Student>();
            string TempName;
            int TempGroup;
            byte[] TempMarks = new byte[3];
            while (br.PeekChar() > -1)
            {
                TempName = br.ReadString();
                TempGroup = br.ReadInt32();
                TempMarks[0] = br.ReadByte();
                TempMarks[1] = br.ReadByte();
                TempMarks[2] = br.ReadByte();

                EndStudents.Add(new Student(TempName, TempGroup, TempMarks));
            }
            br.Close();
            second_fs.Close();

            List<Mark> Marks = new List<Mark>();
            Marks.Add(new Mark(1, 0, 0));
            Marks.Add(new Mark(2, 0, 0));
            Marks.Add(new Mark(3, 0, 0));

            foreach (Student i in EndStudents)
            {
                switch (i.group)
                {
                    case 1:
                        Marks[0].number++;
                        Marks[0].sum += (i.marks[0] + i.marks[1] + i.marks[2]) / 3;
                        break;
                    case 2:
                        Marks[1].number++;
                        Marks[1].sum += (i.marks[0] + i.marks[1] + i.marks[2]) / 3;
                        break;
                    case 3:
                        Marks[2].number++;
                        Marks[2].sum += (i.marks[0] + i.marks[1] + i.marks[2]) / 3;
                        break;
                }

            }

            foreach(Student i in EndStudents)
            {
                switch (i.group)
                {
                    case 1:
                        if (((i.marks[0] + i.marks[1] + i.marks[2]) / 3) >= (Marks[0].sum / Marks[0].number))
                            Console.WriteLine(i.name);
                        break;
                    case 2:
                        if (((i.marks[0] + i.marks[1] + i.marks[2]) / 3) >= (Marks[1].sum / Marks[1].number))
                            Console.WriteLine(i.name);
                        break;
                    case 3:
                        if (((i.marks[0] + i.marks[1] + i.marks[2]) / 3) >= (Marks[2].sum / Marks[2].number))
                            Console.WriteLine(i.name);
                        break;
                }

            }

            Console.ReadLine();
        }
    }
}