using System;

public class Program

{

    public static void Main()

    {

        Console.WriteLine("Enter first grade here: ");

        int grd1 = int.Parse(Console.ReadLine());

        Console.WriteLine("Enter second grade here: ");

        int grd2 = int.Parse(Console.ReadLine());

        Console.WriteLine("Enter third grade here: ");

        int grd3 = int.Parse(Console.ReadLine());

        if (((grd1+grd2+grd3)/3)>90)

        {

            Console.WriteLine("The avarage grade is bigger than 90 and it is: "+((grd1+grd2+grd3)/3));

    }

}}