#include <iostream>
#include <boost/multiprecision/cpp_int.hpp>
namespace mp = boost::multiprecision;
using ll = mp::cpp_int;
using namespace std;
void ins() {}
template<class T,class... Rest>void ins(T& v,Rest&... rest){cin>>v;ins(rest...);}
#define rep(i,n) for(int i=0,_i=(n);i<_i;++i)

int main() {
  int N; cin >> N;

  ll ans = 0;
  rep(i, N) {
    string s; cin >> s;
    bool negative = s[0] == '-';
    if (negative) s = s.substr(1);
    auto pos = s.find(".");

    if (s == "0") continue;
    if (pos == string::npos)
      s += "0000000000";
    else {
      int len = s.size() - 1 - pos;
      rep(j, 10-len)
        s += "0";
      s = (s.substr(0, pos) == "0" ? "" : s.substr(0, pos)) + s.substr(pos+1);
    }
    while (s[0] == '0') s = s.substr(1);
    if (negative) s = '-' + s;
    ans += ll(s);
  }

  bool negative = ans < 0;
  if (negative) ans *= -1;
  string s = ans.str();
  if (ans == 0) {
    cout << 0 << endl;
    return 0;
  }
  if (negative) cout << "-";
  if (s.size() <= 10) {
    string zero = "";
    rep(i, 10-(s.size()-(s[0] == '-')))
      zero += '0';
    cout << "0." << zero << s << endl;
  } else
    cout << s.substr(0, s.size()-10) << "." << s.substr(s.size()-10) << endl;

  return 0;
}