N,M = map(int,input().split())

if M == 0:
    print(N)
    exit()

A = list(map(int,input().split()))
B = [False]*(N+1)

for i,v in enumerate(A):
    B[v] = True

#print("B",B)
ans = [0]*(N+1)
tmp = N//2+1

for i,v in enumerate(B):
    if v and i>=tmp:
        ans[i] = 1

#print(ans)

for i in range(tmp-1,0,-1):
    
    
    tmp2 = N//i
#    print("i=",i,"tmp2",tmp2)
    cnt = 0

    for j in range(tmp2):
        if ans[i*(j+1)] == 1:
            cnt+=1

#    print("cnt",cnt)
    
    if cnt%2 == 0 and B[i]:
        ans[i] = 1
    elif cnt%2 == 1 and not B[i]:
        ans[i] = 1


print(N-sum(ans))
#print(ans)