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

#include <iostream>
#include <iomanip>
using namespace std;

int main()
{
  int sum = 0, count = 0;
  int number;

  cin >> number;
  while ( cin )
  {
    sum = sum + number;
    ++count;
    cin >> number;
  }
  if ( count == 0 )
    cout << "No average for an empty input." << endl;
  else {
    double average = double(sum) / double(count);
    cout << setprecision(3);
    cout << "Average: " << average << endl;
  }
  return 0;
}