using System;

public class Program

{

    public static void Main()

    {

        int i,count,j,sum=0;

        Console.Write("enter m,n");

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

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

        for(i=m;i<=n;i++)

        {

            count = 0;

            for(j=1;j<=i;j++)

            {

                if(i%j == 0)

                {

                    count++;

                }

            }

            if(count == 2)

            {

                Console.WriteLine("{0}",i);

                sum = sum + i;

            }

        }

        Console.WriteLine("sum = {0}",sum);

    }

}