#include <iostream>
#include <vector>

using namespace std;


int main ()
{
   vector<int> nlist;

   nlist.push_back (5);
   nlist.push_back (12);
   nlist.insert (nlist.begin()+1, 4);
   nlist.push_back (1);
   nlist[0] = 2 * nlist[2];
   nlist.erase (nlist.begin()+2);
   nlist.push_back (3);
   nlist.insert (nlist.begin(), 7);

   cout << "list = { ";
   for (int i = 0; i < nlist.size() - 1; i++)
       cout << nlist[i] << ", ";
   cout << nlist[nlist.size()-1] << " }" << endl;
}