#include <bits/stdc++.h>
using namespace std;
 
typedef long long ll;
typedef vector<int> vi;
typedef pair<int,int> pi;
#define F first
#define S second
#define PB push_back
#define MP make_pair
#define REP(i,a,b) for (int i = a; i <= b; i++)
 
int main() {
	ios_base::sync_with_stdio(0);
	cin.tie(0);
	//freopen("input.txt", "r", stdin);
	//freopen("output.txt", "w", stdout);
	int p, n;
	double tp=0;
	cin >> n;
	REP(i, 1, n) {
		cin >> p;
		tp += p;
	}
	printf("%.12lf", ((tp / 100) / n)*100);
 
	return 0;
}

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Mwo1MCA1MCAxMDA=

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