BOJ-1546

#include <algorithm>
#include <iostream>

using namespace std;

double arr[1001];
int main() {
    ios::sync_with_stdio(0);
	cin.tie(0); cout.tie(0);

    int N;
    cin >> N;
    for (int i=0; i<N; i++) {
        cin >> arr[i];
    }

    sort(arr, arr+N, greater<int>());
    double M = arr[0];
    double sum = 0;
    if (M==0) cout << 0;
    else {
        for (int j=0; j<N; j++) {
            arr[j] = arr[j]/M*100;
            sum = sum+arr[j];
        }

        cout << sum/double(N);
    }
    return 0;
}