from math import sqrt
def Divisor(N):
    ret = []
    for i in range(1,int(sqrt(N))+1):
        if N % i == 0:
            ret.append(i)
            if N // i != i:
                ret.append(N//i)
    return ret

N,M = map(int,input().split())
A = list(map(int,input().split()))
Locker = [0] * (N+1)
for a in A:
    Locker[a] = 1
Flg = [0] * (N+1)
ans = 0
for i in range(N,0,-1):
    if Flg[i] == Locker[i]:
        ans += 1
    else:
        P = Divisor(i)
        for p in P:
            Flg[p] ^= 1
print(ans)