#include <stdio.h>
#include <stdlib.h>

main()

{
char	filename[320];
FILE	*fpt,*fpt2;
int	i,j;
char	line[320];
int	bites;
int	sum,total_meals;


fpt=fopen("filenames.txt","r");
sum=total_meals=0;
while (1)
  {
  i=fscanf(fpt,"%s",filename);
  if (i != 1)
    break;
  fpt2=fopen(filename,"r");
  fgets(line,320,fpt2);	/* header line */
//  printf("reading %s\n",filename);
  while (1)
    {
    if (fgets(line,320,fpt2) == NULL)
      break;
    i=0;
	/* find bites */
    while (line[i] != ',')
      i++;
    i++;
    while (line[i] != ',')
      i++;
    i++;
    j=i;
    while (line[j] != ',')
      j++;
    line[j]=0;
    bites=atoi(&(line[i]));
    if (bites > 0)
      {
      printf("%d\n",bites);
      sum+=bites;
      total_meals++;
      }
    }
  fclose(fpt2);
  }
fclose(fpt);
printf("average=%d\n",sum/total_meals);
}