import sys

int1 = lambda x: int(x) - 1

# input = lambda: sys.stdin.buffer.readline()
input = lambda: sys.stdin.readline().rstrip()
ii = lambda: int(input())
i1 = lambda: int1(input())
mi = lambda: map(int, input().split())
mi1 = lambda: map(int1, input().split())
li = lambda: list(mi())
li1 = lambda: list(mi1())
lli = lambda n: [li() for _ in range(n)]

INF = float("inf")
mod = int(1e9 + 7)
# mod = 998244353

n, m = mi()
f = [0] * (n + 1)
for a in li():
    f[a] = 1
divs = [list() for i in range(n + 1)]
for i in range(1, n + 1):
    for j in range(i, n + 1, i):
        divs[j].append(i)
ans = 0
for i in range(1, n + 1)[::-1]:
    if f[i] == 0:
        ans += 1
    else:
        for d in divs[i]:
            f[d] ^= 1
print(ans)