n, k = map(int, input().split())
p = [0 for i in range(n+1)]
for i in range(2, n+1):
    if p[i]>0: continue
    j = i*2
    while j<=n:
        p[j] += 1
        j+=i
    p[i] = 1
print(len([x for x in p if x>=k]))