#include <cstdio>
#include <cmath>

int main( void ){
	int A, B;
	if(!scanf( "%d%d", &A, &B ))
		return -1;
	int days = 3;
	for (int i = 0; i < 3; i++){
		if ((A <=( 23 + i ) ) && (( 23 + i ) <= B ))
			days--;
	}
	printf( "%d\n", days );
	return 0;
}