N, K = map(int, input().split())

if K == 1:
    print(N - 2 + 1)
    quit()

dp = [0] * (N + 1)

for p in range(2, N + 1):
    if p**2 > N:
        break
    if dp[p] > 0:
        continue
    for m in range(p, N + 1, p):
        dp[m] += 1

ans = 0

for d in dp:
    if d >= K:
        ans += 1

print(ans)