#include <iostream>
#include <string>
#define ll long long
using namespace std;

int main(){
    int N;
    cin >> N;
    ll sum_ll = 0;
    ll sum_double = 0;
    string a;

    for (int i = 0; i < N; i++) {
        cin >> a;
        int comma = a.find(".");
        if (!(comma != string::npos)) {
            sum_ll += stoll(a);
        } else {
            sum_ll += stoll(a.substr(0, comma));
            string a_double = a.substr(comma + 1);
            for (int j = a_double.length(); j < 10; j++) {
                a_double += "0";
            }
            sum_double += stoll(a_double);
        }
    }

    // 小数点部分の合計を整数部分と少数部分に分離
    string sum_double_str = to_string(sum_double);
    int sum_double_str_len = sum_double_str.length();
    if (sum_double_str_len > 10){
        ll sum_double_ll = stoll(sum_double_str.substr(0, 10 - sum_double_str_len));
        sum_ll += sum_double_ll;
        sum_double_str = sum_double_str.substr(10 - sum_double_str_len);
    } else {
        for (int j = sum_double_str.length(); j < 10; j++) {
            sum_double_str += "0";
        }
    }
    
    cout << sum_ll << "." << sum_double_str;

    return 0;
}