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

namespace SortedStructs
{
    public struct Student
    {
        public string Name;
        public int Group;
        public int[] Grades;

        public Student(string n)
        {
            Name = n;
            Group = 0;
            Grades = new int[5];
        }
        public override string ToString()
        {
            StringBuilder sb = new StringBuilder();
            sb.Append("Student:\n\tName - ");
            sb.Append(this.Name);
            sb.Append("\n\tGroup - ");
            sb.Append(this.Group);
            if (this.Grades.Average() > 4.0)
            {
                sb.Append("\n\tAverage grade - ");
                sb.Append(this.Grades.Average());
            }
            else
            {
                sb.Append("\n\tCannot show so low grades!");
            }
            return sb.ToString();
        }
    }
    class Program
    {
        const int COUNT_OF_STUDENTS = 10;
        static void Main(string[] args)
        {
            Student[] students = new Student[COUNT_OF_STUDENTS];
            for (int i = 0; i < COUNT_OF_STUDENTS; i++)
            {
                Console.WriteLine("Please, enter student's name:");
                students[i] = new Student(Console.ReadLine());
                Console.WriteLine("Please, enter student's group:");
                students[i].Group = int.Parse(Console.ReadLine());
                for (int j = 0; j < 5; j++)
                {
                    Console.WriteLine("Please, enter the grade #" + (j + 1).ToString() + ":");
                    students[i].Grades[j] = int.Parse(Console.ReadLine());
                }
            }
            IEnumerable<Student> query = students.OrderBy(st => st.Group);
            foreach (Student st in query)
            {
                Console.WriteLine(st.ToString());
            }
        }
    }
}