N,K = map(int,raw_input().split())
fn = [1]*(N+1)
fn[0] = fn[1] = 0
is_p = [True]*(N+1)
for f in xrange(2,N/2+1):
	if not is_p[f]:continue
	d = f*2
	while d <= N:
		if is_p[d]:
			is_p[d] = False
		else:
			fn[d] += 1
		d += f
print len(filter(lambda x:x>=K,fn))