N,M = map(int, input().split())
A = list(map(int, input().split()))
misslist = [False]*N
goodlist = [False]*N
for i in A:
    misslist[i-1] = True
for i in range(1,N+1):
    if (N//i)%2 == 1:
        goodlist[i-1] = True

def make_divisors(n):
    lower_divisors , upper_divisors = [], []
    i = 1
    while i*i <= n:
        if n % i == 0:
            lower_divisors.append(i)
            if i != n // i:
                upper_divisors.append(n//i)
        i += 1
    return lower_divisors + upper_divisors[::-1]

sabori = 0
for i in reversed(range(N)):
    if goodlist[i] != misslist[i]:
        sabori += 1
        refine = make_divisors(i+1)
        for j in refine:
            misslist[j-1] = not misslist[j-1]

print(sabori)