def make_divisors(n):
    divisors = []
    for i in range(1, int(n**0.5)+1):
        if n % i == 0:
            divisors.append(i)
            if i != n // i:
                divisors.append(n//i)

    divisors.sort()
    return divisors


n,m = map(int,input().split())
a = [int(i) for i in input().split()]

A = [0]*(n+1)
for i in range(m):
    A[a[i]] = 1

#print(A)
li = [0]*(n+1)
ans = 0

for i in range(n,0,-1):
    if A[i] != li[i]:
        for j in make_divisors(i):
            li[j] += 1
            li[j] %= 2
    else:
        ans += 1

print(ans)