#int(input())
#map(int, input().split())
#list(map(int, input().split()))

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

r = [0] * (N+1)
for i in range(M):
    r[A[i]] = 1

ans = 0
for i in range(N, 0, -1):
    if r[i] == 0:
        ans += 1
        continue
    for j in range(1, i):
        if j ** 2 > i:
            break
        elif i % j != 0:
            continue
        if j ** 2 == i:
            r[j] ^= 1
        else:
            r[j] ^= 1
            r[i//j] ^= 1

print(ans)