/*      $NetBSD: pages.c,v 1.2 1998/01/09 08:05:09 perry Exp $  */

#include <stdio.h>

#define T_INIT  0100
#define T_STOP  0111

long    charin;                 /* number of input character */

main(argc, argv)
char    **argv;
{

        int      npages = 0;
        register int    c;

        while((c=getchar()) != EOF) {
                charin++;
                c &= 0377;
                if(c != T_INIT)
                        continue;
                else {
                        c=getchar();
                        c &= 0377;
                        if(c == T_STOP) {
                                npages++;
                                charin++;
                        }
                }
        }
        if(charin<5) {
                fprintf(stderr, "%s: no input\n", argv[0]);
                exit(1);
        }
        printf("%d\n", npages);
}