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);