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


char *
getsect(int * dest, char * pch, char expect)
{
	char * end;

	if (!pch)
		return NULL;
	*dest = strtol(pch, &end, 10);
	if (*dest == 0 && end == pch)
		return NULL;
	if (*end != expect)
		return NULL;
	if (expect)
		++end;
	return end;
}


int
main()
{
	char buf[BUFSIZ];
	int overlaps = 0;

	while (fgets(buf, sizeof(buf), stdin)) {
		int n[4];
		char * pbuf;

		pbuf = getsect(&n[0], buf, '-');
		pbuf = getsect(&n[1], pbuf, ',');
		pbuf = getsect(&n[2], pbuf, '-');
		pbuf = getsect(&n[3], pbuf, '\n');
		if (!pbuf) {
			fprintf(stderr, "Unexpected line: %s\n", buf);
			return -1;
		}
		if (!(n[3] < n[0] || n[2] > n[1])) {
			++overlaps;
		}
	}

	printf("Overlaps: %d\n", overlaps);

	return 0;
}