#include <stdio.h>
main ( ) {
  int average, size_one, size_two, size_three;
  printf ("Please type three trade sizes.\n");
  scanf ("%i", &size_one);
  scanf ("%i", &size_two);
  scanf ("%i", &size_three);
  average = (size_one + size_two + size_three) / 3;
  printf ("The average of the trade sizes is %i.\n", average);
}