#include <stdio.h>
#include <stdlib.h>
#include <sys/mman.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <unistd.h>
#include <string.h>

int main(int argc,char *argv[]) {
	int fd;
	char *addr;
	char *pointer;
	char *end;
	char bt[256];
	struct stat sb; 
	int i;
	int count = 0;

	if (argc < 2) {
		fprintf (stderr, "Usage: treti file\n");
		return 1;
	}

	fd = open(argv[1], O_RDONLY);
	if (fd == -1) {
		fprintf (stderr, "Can't open file %s\n", argv[1]);
		return 2;
	}

	if (fstat(fd, &sb) == -1) {          /* To obtain file size */
		fprintf (stderr, "Can't get file size!\n");
		return 2;
	}

	addr = mmap (NULL, sb.st_size, PROT_READ, MAP_PRIVATE, fd, 0);
	if (addr == MAP_FAILED) {
		fprintf (stderr, "Can't map file\n");
		return 2;
	}

	for (i = 0; i < 256; i++) bt[i] = 0;
	bt[' '] = bt['\t'] = bt['\n'] = 1;

	for (pointer = addr, end = addr + sb.st_size; pointer < end; pointer++) {

		if (*(pointer + 1) == 'f' && 
		*(pointer + 2) == 'i' && *(pointer + 3) == 'l' &&
		*(pointer + 4) == 'e' && bt[*(pointer + 5)] && bt[*pointer]) {
			count++;

		} 
	}
	printf ("%d\n", count);
	return 0;
}