N,K = map(int,raw_input().split())
ret = 0
use = [0 for i in range(N + 1)]
for i in range(2,N + 1):
	if use[i] == 0:
		for j in range(i * 2,N + 1,i):
			use[j] += 1
	if use[i] == 0:
		use[i] += 1
	if use[i] >= K:
		ret += 1
print ret