// ave.c: Pure C implementation of ave.cpp
//        Reads integers until end-of-file; no prompt for input.

#include <stdio.h>

int main()
{
  int sum = 0, count = 0;
  int number;
  scanf("%d", &number);
  while ( !feof(stdin) )
  {
    sum += number;
    ++count;
    scanf("%d", &number);
  }
  if ( count == 0 )
    printf("No average for an empty input.\n");
  else
    printf("Average: %.3g\n", (double)sum / (double)count);
  return 0;
}