#include <bits/stdc++.h>
using namespace std;

#include <boost/multiprecision/cpp_int.hpp>
#include <boost/multiprecision/cpp_dec_float.hpp>
using namespace boost::multiprecision;

using bint = cpp_int;
using bdec = cpp_dec_float_100;
// using bdec = number<cpp_dec_float<10000>>;

template <class A, class B> bool cmin(A& a, B b) { return a > b && (a = b, true); }
template <class A, class B> bool cmax(A& a, B b) { return a < b && (a = b, true); }

signed main() {
  cin.tie(nullptr)->sync_with_stdio(false);

  int N;
  cin >> N;
  bdec ans = 0;
  while (N--) {
    bdec in;
    cin >> in;
    ans += in;
  }
  cout << fixed << setprecision(10) << ans << '\n';
}