// ave.cpp: compute average of integers read from standard input
//          Reads integers until end-of-file; no prompt for input.

#include <iostream>
using namespace std;

int main()
{
   int sum = 0, count = 0;
   int number;
   cin >> number;
   while ( cin )
   {
      int new_sum = sum + number;
      sum = new_sum;
      ++count;
      cin >> number;
   }
   if ( count == 0 )
      cout << "No average for an empty input." << endl;
   else
      cout << "Average: " << float(sum) / float(count) << endl;
   return 0;
}