n, k = map(int, input().split())
cand = [0 for _ in range(n - 1)]
for i in range(2, n + 1):
    pos = i - 2
    if cand[pos] == 0:
        for j in range(pos, n - 1, i):
            cand[j] += 1
ans = 0
for num in cand:
    if num >= k:
        ans += 1
print(ans)