n,m=map(int,input().split())
a=list(map(int,input().split()))
lis=[1]*(n+1)
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]
for i in range(1,n+1):
    div=make_divisors(i)
    for num in div:
        lis[num]=1-lis[num]
lis2=[1]*(n+1)
for i in range(m):
    lis2[a[i]]=0
ans=0
for i in range(n,0,-1):
    if lis[i]!=lis2[i]:
        ans+=1
        l=make_divisors(i)
        for j in l:
            lis[j]=1-lis[j]
    else:
        continue
print(ans)