n,m = map(int,input().split())
a = list(map(int,input().split()))
g = [0] * (n+1)
for i in range(m):
    g[a[i]] = 1

boo = [1] * (n+1) #サボったら0

ans = 0
for i in range(n,0,-1):
    coef = 1
    cnt = 0
    while i * coef <= n:
        cnt += boo[i * coef]
        coef += 1
    
    if cnt%2 != g[i]:
        boo[i] = 0
        ans += 1

print(ans)