using System;

​

public class Program

{

    public static void Main()

    {

        int totalGroups = 3;

        int totalKidsPerGroup = 4;

        int minAvearge = Int32.MaxValue;

        for (int i = 1; i <= totalGroups; i++)

        {

            int averagePerGroup = 0;

            int sumOfGradesPerGroup = 0;

            for (int j = 1; j <= totalKidsPerGroup; j++)

            {

                Console.WriteLine("Please provide the grade for kid {0} in group {1} ", j, i);

                int grade = 0;          

​

                while(true)

                {

                    grade = Int32.Parse(Console.ReadLine());

​

                    if(grade < 0)

                    {

                        Console.WriteLine("Please provide only positive grades");

                    }

                    else

                    {

                        sumOfGradesPerGroup += grade;

                        break;

                    }

                }

            }

            averagePerGroup = sumOfGradesPerGroup / totalKidsPerGroup;

            Console.WriteLine("Average per group {0} is {1}", i, averagePerGroup);

            if(minAvearge > averagePerGroup)

            {

                minAvearge = averagePerGroup;

                Console.WriteLine("Current min Average {0} ", minAvearge);

            }

        }

        Console.WriteLine("The smallest average is {0}", minAvearge);

     }

}