#include <bits/stdc++.h>

using namespace std;

int main() { 
    double N, sum = 0;

    cin >> N;

    vector<double> A(N);
    for (int i = 1; i <= N; i++){
        cin >> A.at(i);
        sum += A.at(i);
    }
    cout << sum << endl;
    return 0;
}