import sys
read = sys.stdin.buffer.read
readline = sys.stdin.buffer.readline
readlines = sys.stdin.buffer.readlines

import numpy as np

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

def make_prime(U):
    is_prime = np.zeros(U,np.bool_)
    is_prime[2] = 1
    is_prime[3::2] = 1
    M = int(U**.5)+1
    for p in range(3,M,2):
        if is_prime[p]:
            is_prime[p*p::p+p] = 0
    return is_prime, is_prime.nonzero()[0]

U = 2 * 10 ** 6 + 10
_,primes = make_prime(U)
cnt = np.zeros(U,np.int32)
for p in primes:
    cnt[p::p] += 1

x = cnt[2:N+1]
answer = np.count_nonzero(x >= K)
print(answer)