Prime3

#include <iostream>
using namespace std;

int main()
{
    int n;
    cin>>n;
    int a;
    unsigned long long int c=0;
    for(int i=1;i<=n;++i)
    {
        cin>>a;
        int j=2,prim=1;
        while(j*j<=a&&prim==1)
        {
            if(a%j==0)
            {
                prim=0;
                break;
            }
            ++j;
        }
        if(a>1&&prim)
            c+=a;
    }
    cout<<c;
    return 0;
}