#include <fstream>

using namespace std;
ifstream in("ciur.in");
ofstream out("ciur.out");
bool v[200000001];
int gigel;
int main()
{
    int n,j,i;
    in>>n;
    for(i=1;i<=n;i++)
    {
        in>>v[i];
    }
    for(i=2;i<=n;i++)
    {
        if(v[i]==0)
        {
            for(j=i*i;j<=n;j=j+1)
        {
            v[j*i]=1;
        }
        }

    }
    for( i=1; i<=n; i++)
    {
    if(v[i]==0)
    gigel++;
    }
    out <<gigel;
    return 0;
}