#include <fstream>

using namespace std;
ifstream cin ("ciur.in");
ofstream cout ("ciur.out");
const int NMAX=1000000;
bool c[NMAX+5];
int main()
{
    int n,i,x,cnt,j;
    n=NMAX;
    c[0]=c[1]=1;
    for(i=4;i<=n;i=i+2)
        c[i]=1;
    for(i=3;i*i<=n;i=i+2)
        if(c[i]==0)
        for(j=i*i;j<=n;j=j+2*i)
             c[j]=1;
    cin>>n;
    cnt=0;
    for(i=1;i<=n;i++)
    {
        cin>>x;
        if(c[x]==0)
            cnt++;
    }
    cout<<cnt;
    return 0;
}