def div(n):
    S = set()
    i = 1
    while i * i <= n:
        if n % i == 0:
            S.add(i)
            S.add(n // i)
        i += 1
    return S

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

D = [0] * (N + 1)
for a in A:
    D[a] += 1
    
ans = 0
E = [0] * (N + 1)
for i in range(N, 0, -1):
    if D[i] == E[i]:
        ans += 1
    else:
        for d in div(i):
            E[d] = 1 - E[d]
print(ans)