import sys
import pypyjit
import itertools
import heapq
import math
from collections import deque, defaultdict, Counter
import string
import random

input = sys.stdin.readline
sys.setrecursionlimit(10 ** 6)
pypyjit.set_param('max_unroll_recursion=-1')


N, M = map(int, input().split())
A = list(map(int, input().split()))

divs = [[] for _ in range(N + 1)]
for i in range(1, N + 1):
    for j in range(1, N + 1):
        if i * j > N:
            break
        divs[i].append(i * j)

actual = [False] * (N + 1)
for a in A:
    actual[a] = True

done = [None] * (N + 1)
ans = 0
for i in range(1, N + 1)[::-1]:
    expected = True
    for j in divs[i]:
        if i == j:
            continue
        if done[j]:
            expected = not expected
    done[i] = expected is actual[i]

ans = 0
for i in range(1, N + 1):
    if done[i] is False:
        ans += 1
print(ans)