N,M = map(int, input().split())
A = list(map(int, input().split()))
L = [0]*(N+1)
DOOR = [0]*(N+1)
for i in range(1,N+1):
    for j in range(i,N+1,i):
        L[j] = (L[j]+1)%2
for a in A:
    DOOR[a]=1
cnt = 0
for i in range(N+1):
    if L[i]!=DOOR[i]:
        cnt+=1
        for j in range(i,N+1,i):
            DOOR[j]=(DOOR[j]+1)%2
print(cnt)