n, m = map(int, input().split())
A = list(map(int, input().split()))

P = [0 for _ in range(n + 1)]
for i in range(1, n + 1):
    for j in range(i * 2, n + 1, i):
        P[j] = i

C = [0 for _ in range(n + 1)]
for i in range(m):
    C[A[i]] += 1

R = [0 for _ in range(n + 1)]
ans = 0
for i in range(n, 0, -1):
    if (R[i] + 1) % 2 != C[i]:
        ans += 1
    else:
        f = 1
        while f * f <= i:
            if i % f == 0:
                if f == i // f:
                    R[f] = (R[f] + 1) % 2
                else:
                    R[f] = (R[f] + 1) % 2
                    R[i // f] = (R[i // f] + 1) % 2
            f += 1
print(ans)