Problema 8 tema, gresita, nu merge

//E gresita, nu merge.

#include <iostream>

using namespace std;

int main()
{
    int x,n,cx,numar,S=0,OK=1,i;
    cout<<"n="<<endl;
    cin>>n;
    for (x=n;x>1;x=x-1)
    {
        cx=x;
        numar=x;
        while(cx)
        {
        S=S + (cx%10);
        cx=cx/10;
        }

        for (i=2;i<=S-1;i++)
        {
            if (S%i==0)
            OK=0;
        }
        if (OK==1)
        cout<<numar<<endl;
    }
    return 0;
}