Dev - C++ - error en este codigo

#include <iostream>

#include <cmath>

#define DIM 10

using namespace std;

int main(){

    long i,j,p,x[DIM],l=3;

    long s=0;

         for(i=3;i<=9;i++){

                      cout<<"x["<<i<<"] = ";

                      cin>>x[i];

                      cout<<endl;

                      }

         for(i=1;i<=3;i++){

                      p=1;

                      for(j=1;j<=2*i;j++)

                      p*=j;

                      s+=pow(-1,i+1)*x[l]*x[l+1]*x[l+2]/p;

                      l+=2;

                      }

                      cout<<"\n\n"<<s;

                      cout<<"\n\nPresione <ENTER> para retornar al editor"<<endl;

                      system("pause");

                      return EXIT_SUCCESS;

}

s+=pow(-1.0,i+1)*x[l]*x[l+1]*x[l+2]/p;