using System;
public class Program
{
public static void Main()
double sum=0;
for(int i=1;i<=5;i++)
Console.Write("input {0} :" ,i);
double n = Convert.ToDouble(Console.ReadLine());
if(n>0)
sum += n;
else
i--;
}
Console.WriteLine("sum = {0}" ,sum);
Console.WriteLine("Average ={0}" ,sum/5);