import sys
input = lambda :sys.stdin.readline()[:-1]
ni = lambda :int(input())
na = lambda :list(map(int,input().split()))
yes = lambda :print("yes");Yes = lambda :print("Yes");YES = lambda : print("YES")
no = lambda :print("no");No = lambda :print("No");NO = lambda : print("NO")
#######################################################################

n,m = na()
a = na()
f = [0]*(1+n)
for i in range(m):
    f[a[i]] = 1
c = 0
for i in range(n,0,-1):
    for j in range(i*2, n+1, i):
        f[i] ^= f[j]
    if f[i] ^ 1:
        c += 1
    #print(f)

print(c)