#include <iostream>
using namespace std;

int main(void){
    int n;
    int *A;
    float sum = 0;
    cin >> n;
    A = new int[n];
    for(int i = 0; i < n; i++){
        cin >> A[i];
        sum+=A[i];
    }
    cout << sum / n << endl;
    return(0);
}