/*
   Define VERBOSE to insert 1 if you want two complete sentences.
   Define VERBOSE to insert 0 if you want two numbers only.
*/
#define VERBOSE 1
#include <stdio.h> 
/* Define the trade structure */
struct trade {double price; int number;};
/* Define auxiliary functions */
double mean_price (struct trade **array, int length) {
  int counter; double sum = 0.0; 
  for (counter = 0; counter < length; ++counter)
    sum = sum + array[counter] -> price;
  return sum / counter;
}
double mean_size (struct trade **array, int length) {
  int counter; double sum = 0.0; 
  for (counter = 0; counter < length; ++counter)
    sum = sum + array[counter] -> number;
  return sum / counter;
}
/* Define trade array */
struct trade *trade_pointers[100];
main ( ) {
  /* Declare various variables */
  int limit, counter, number;
  double price;
  /* Read numbers from the file and stuff them into array */
  for (limit = 0;
       2 == scanf ("%lf%i", &price, &number);
       ++limit) {
    trade_pointers[limit] 
      = (struct trade*) malloc (sizeof (struct trade));
    trade_pointers[limit] -> price = price;
    trade_pointers[limit] -> number = number;
  }
  /* Perform analysis */
  if (VERBOSE) {
    printf ("The mean price per share of the trades is %.2f.\n",
            mean_price (trade_pointers, limit));
    printf ("The mean number of shares traded is %.0f.\n",
            mean_size (trade_pointers, limit));
    }
  else {
    printf ("%.2f %.2f", 
            mean_price (trade_pointers, limit),
            mean_size (trade_pointers, limit));
  }
}