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

state = [0]*(N+1)
for i in range(N, 0, -1):
    for j in range(i, N+1, i):
        state[i] ^= 1

ans = [0]*(N+1)
for i in range(N, 0, -1):
    v = state[i]
    for j in range(2*i, N+1, i):
        v ^= ans[j]
    if (i in A) ^ v:
        ans[i] = 1

print(sum(ans))