#include <iostream>
#include <iomanip>
#include <fstream>

using namespace std;

int main() {
    int numValue = 0;
    double temp = 0;
    double sum = 0;
    double average = 0;

    cout << fixed << setprecision(2);

    ifstream infile;
    infile.open("input.txt");

    if (infile) {
        infile >> numValue;

        if (numValue != 0) {

            for (int i = 0; i < numValue; i++) {
                infile >> temp;
                sum += temp;
            }

            average = (sum / temp);
            cout << "The average of these numbers are " << average << endl;
        }
        else {
            cout << "Error! Cannot compute the average if there are no values." << endl;
        }
    }
    else {
        cout << "Error! Unable to open the file." << endl;
    }

    infile.close();
    cin.ignore();
    cin.get();
    return 0;
}