import numpy as np

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


def primes(n):
    is_prime = [True] * (n + 1)
    is_prime[0] = False
    is_prime[1] = False
    for i in range(2, int(n ** 0.5) + 1):
        if not is_prime[i]:
            continue
        for j in range(i * 2, n + 1, i):
            is_prime[j] = False
    return (i for i in range(n + 1) if is_prime[i])


A = np.zeros(N + 1, dtype=int)
for p in primes(N):
    A[p::p] += 1
print(np.count_nonzero(A >= K))