#include <iostream>
#include <iomanip>
using namespace std;

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

    double a, sum = 0;

    for (int i = 0; i < n; i++) {
        cin >> a;
        sum += a;
    }

    cout << fixed << setprecision(1) << sum;

    return 0;
}