#include <iostream>
using namespace std;
int main() {
int n;
std::cin >> n;
if (n < 1) {
return 0;
}
// Write your dynamic buffer allocation code here
int *buffer = new int[n];
int i=0;
int total = 0;
while(i<n){
cin >> buffer[i];
total+=buffer[i];
i++;
}
double average = static_cast <double> (total) / n;
cout << average;
delete[] buffer;
return 0;
}