n, m = map(int, input().split())
A = list(map(int, input().split()))
open = [False] * (n + 1)
for a in A:
    open[a] = True
ans = 0

for i in range(n, 0, -1):
    if not open[i]:
        ans += 1
        continue
    for j in range(1, int(i ** 0.5 + 1)):
        if i % j == 0:
            open[j] ^= True
            if j * j != i:
                open[i // j] ^= True
print(ans)