#include <boost/multiprecision/cpp_dec_float.hpp>
#include <iomanip>
#include <iostream>
#include <string>
using namespace std;

int main() {
	int N;
	cin >> N;
	boost::multiprecision::cpp_dec_float_50 ans;
	for (int i = 0; i < N; ++i) {
		string A;
		cin >> A;
		boost::multiprecision::cpp_dec_float_50 tmp(A);
		ans += tmp;
	}
	cout << fixed << setprecision(10) << ans;
}