Suma a n numere prime

#include <iostream>
using namespace std;

int main()
{
    int i=1, s=0, d, n, prim, x;
    cout<<"n=";
    cin>>n;
    prim=0;
    while(i<=n)
    {
        cin>>x;
        i++;
        for(d=2; d<=x/2; d++)
            if(x%d==0)
                prim=1;
        if(prim==0)
            s=s+x;
    }
    cout<<"Suma numerelor prime este "<<s;
    return 0;
}