using System;

public class Program

{

    public static void Main()

    {

        Console.WriteLine("Hello World");

        int[]a=new int[25];

        int k=100;

        for(int i=0;i<a.Length;i+=5)

        {

            a[i]=k;

            k+=100;

        }

        Random r=new Random();

        for(int i=1;i<a.Length-3;i+=5)

        {

            a[i]=r.Next(1,29);

        }

        for(int i=2;i<a.Length-2;i+=5)

            a[i]=r.Next(1,13);

        for(int i=3;i<a.Length-1;i+=5)

            a[i]=r.Next(1990,1994);

        for(int i=4;i<a.Length;i+=5)

            a[i]=r.Next(55,101);

        print(a);

        twins(a,17,1);

        int[]x=highestavg(a);

        print(x);

    }

    public static void twins(int[]a,int day,int month)

    {

        int c=0;

        for(int i=1;i<a.Length-3;i+=5)

        {

            if(a[i]==day && a[i+1]==month)

            {

                c++;

                Console.WriteLine(a[i-1]);

            }

        }

        if(c==0)

            Console.WriteLine("no students found");

    }

    public static int[]highestavg(int[]a)

    {

        int max=a[4];

        for(int i=9;i<a.Length;i+=5)

        {

            if(a[i]>max)

                max=a[i];

        }

        int c=0;

        for(int i=4;i<a.Length;i+=5)

        {

            if(a[i]==max)

                c++;

        }

        int j=0;

        int[]b=new int[c];

        for(int i=4;i<a.Length;i+=5)

        {

            if(a[i]==max)

                b[j++]=a[i-4];

        }

        return b;

    }

    public static void print(int []a)

    {

        for(int i=0;i<a.Length;i++)

            Console.Write(a[i]+ " ");

    }

}