include

include

using namespace std;

int main() {

int n;
double sum = 0;
double result = 0;
cin >> n;
for (int i = 0; i < n; i++) {
	cin >> sum;
	result += sum;
}
cout << fixed << setprecision(2);
cout << result / n;

return 0;

}

include

include

using namespace std;

int main() {

int n;
double sum = 0;
double result = 0;
cin >> n;
for (int i = 0; i < n; i++) {
	cin >> sum;
	result += sum;
}
cout << fixed << setprecision(2);
cout << result / n;

return 0;

}

include

include

using namespace std;

int main() {

int n;
double sum = 0;
double result = 0;
cin >> n;
for (int i = 0; i < n; i++) {
	cin >> sum;
	result += sum;
}
cout << fixed << setprecision(2);
cout << result / n;

return 0;

}