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

int main () {
	int sum = 0;
	unsigned int p1,p2,r1,r2 = 0;

	while (scanf("%u-%u,%u-%u\n", &p1,&p2,&r1,&r2) != EOF) {
		if (((p1 <= r1) && (p2 >= r2)) || ((p1 >= r1) && (p2 <= r2)))
			sum +=1;
	}
	printf("%d\n", sum);

}