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

dat = [0] * (N + 1)
div = [[] for _ in range(N + 1)]
for i in range(1,N + 1):
    for j in range(i,N + 1,i):
        div[j].append(i)
ans = 0
for i in range(N,0,-1):
    if dat[i] == 0 and i not in s:
        ans += 1
        continue
    if dat[i] == 1 and i in s:
        ans += 1
        continue
    for j in div[i]:
        dat[j] ^= 1
print(ans)