using System;
using System.IO;
public static class Program
{
    static void Main()
   {
        string file="marks2D.txt";
    string outfile="average.csv";
    StreamReader sr= new StreamReader(file);
    StreamWriter outstream= new StreamWriter(outfile);
    //double[] field=new double [0];
    string[,] temp=new string[5,6];
     int num=0;
    double ave=0;
    for(int i=0; i<temp.GetLength(0); i++)
    {
        double sum=0;
        string line=sr.ReadLine();
        //temp=line.Split(',');
        for(int j=0; j<temp.GetLength(1); j++)
        {
        double m=double.Parse(line);
        ave = m/5;
            temp[num]=line;
            outstream.WriteLine(ave);
            //Console.Write("{0,1}", temp[i,j]);
        }
        outstream.WriteLine(field[num]);
    }
    Console.WriteLine();
    sr.Close();
    outstream.Close();
    }
}