program ABC170D
    implicit none
    integer(8)::N,i,j,ans=0,amax,as,flg
    integer(8),allocatable::A(:),B(:)
    read*,N
    allocate(A(N))
    read*,A
    amax=maxval(A)
    allocate(B(amax))
    B=0
    call heapsort(N,A)
    do i=1,N
        B(A(i))=1
        if(i>=2.and.A(i)==A(i-1))then
            if(i/=N)A(i-1)=0
            if(i==N)then
                A(i-1)=0
                A(i)=0
            end if
        end if
    end do

    do i=1,N
        if(A(i)/=0)then
            as=int(sqrt(real(A(i))))
            flg=0
            do j=2,as
                if(mod(A(i),j)==0)then
                    if(B(j)==1.or.B(A(i)/j)==1)then
                        flg=1
                        exit
                    end if
                end if
            end do
            if(flg==0)ans=ans+1
        end if
    end do

    print'(i0)',ans
end program ABC170D

subroutine heapsort(n,array)
    implicit none
    integer(8),intent(in) :: n
    integer(8),intent(inout) :: array(1:n)
   
    integer(8) ::i,k,j,l
    integer(8) :: t
   
    if(n.eq.1)return
  
    l=n/2+1
    k=n
    do while(k.ne.1)
       if(l.gt.1)then
          l=l-1
          t=array(L)
       else
          t=array(k)
          array(k)=array(1)
          k=k-1
          if(k.eq.1) then
             array(1)=t
             exit
          endif
       endif
       i=l
       j=l+l
       do while(j.le.k)
          if(j.lt.k)then
             if(array(j).lt.array(j+1))j=j+1
          endif
          if (t.lt.array(j))then
             array(i)=array(j)
             i=j
             j=j+j
          else
             j=k+1
          endif
       enddo
       array(i)=t
    enddo
  
    return
end subroutine heapsort