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

#include <iostream>
#include <iterator>
#include <list>
using namespace std;
int main () 
{
    list<int> mylist;
    for (int i = 0; i < 5; i++) 
        mylist.push_back (i * 20);
    list<int> :: iterator first = mylist.begin();
    list<int> :: iterator last = mylist.end();
    cout << distance(first, last) << endl;
    return 0;
}