n,m = map(int,input().split())
a = set(map(int,input().split()))
def cul(k):
    cnt = 1
    res = set()
    while cnt ** 2 <= k:
        if k%cnt == 0:
            res.add(cnt)
            res.add(k//cnt)
        cnt += 1
    return res
l = [0] * (n+1)
ans = 0
for i in range(n,0,-1):
    val = (1 if i in a else 0)
    if l[i] ^ val:
        for e in cul(i):
            l[e] ^= 1
    else:
        ans += 1
print(ans)