N,M = map(int,input().split())
A = list(map(int,input().split()))
memo = [0] * (N+1)
cnt = [0] * (N+1)
yaku = [[] for _ in range(N+1)]
for a in A:
    memo[a] = 1
for i in range(1,N+1):
    for m in range(1,(N//i) + 1):
        yaku[i*m].append(i)
ans = 0
for i in reversed(range(1,N+1)):
    for k in yaku[i]:
        cnt[k] += 1
        cnt[k] %= 2
    if cnt[i] == memo[i]:
        pass
    else:
        ans += 1
        for k in yaku[i]:
            cnt[k] -= 1
            cnt[k] %= 2
print(ans)