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

B = [0] * (N + 1)
for l in A:
    B[l] = 1

ans = 0
L = [0] * (N + 1)
for i in range(N, 0, -1):
    if L[i] == B[i]:
        ans += 1
    else:
        j = 1
        while j * j <= i:
            if i % j == 0:
                L[j] ^= 1
                if j * j != i:
                    L[i//j] ^= 1
            j += 1

print(ans)