using System;
namespace ConsoleApplication{
class Program {
static void Main(string[] args) {
listElement firstElement=null, lastCreatedElement = null;
for (int i = 1; i <= 5; i++) {
listElement newElement = new listElement();
if (i == 1) firstElement = newElement;
if (lastCreatedElement != null) lastCreatedElement.next = newElement;
int intReadFromConsole = Convert.ToInt32(Console.ReadLine());
newElement.value = intReadFromConsole;
lastCreatedElement = newElement;
}
double sum = 0;
listElement currentElement = firstElement;
for (int i = 1; i <= 5; i++) {
sum = sum + currentElement.value;
currentElement = currentElement.next;
}
sum = sum / 5;
Console.WriteLine(sum);
}
}
class listElement {
public int value;
public listElement next;
}
}
