What will be the output of the following C++ code?

#include <iostream>
#include <vector>
using namespace std;
int main ()
{
    vector<int> myvector;
    int sum (0);
    myvector.push_back (100);
    myvector.push_back (200);
    myvector.push_back (300);
    while (!myvector.empty())
    {
        sum += myvector.back();
        myvector.pop_back();
    }
    cout << sum << '\n';
    return 0;
}