print((function (l, r)
	return
		l<=23 and (r<23 and 3 or r==23 and 2 or r==24 and 1 or 0) or
		l==24 and (r==24 and 2 or 1) or
		l==25 and 2 or 3
end)(io.stdin:read("*n"), io.stdin:read("*n")))