#include <bits/stdc++.h>

using namespace std;
using ll = long long;
using ld = long double;

int main()
{
    cout << setprecision(7);
    cout << fixed;
    vector<ld> z1;

    ld t, ts;
    cin >> t;
    ts = t;
    ld a;
    while (t-- > 0)
    {
        cin >> a;
        z1.push_back(a);
    }
    ld s = 0;
    s = z1.at(0);
    ld u = 4.0, d = 5.0;
    for (int i = 1; i < ts; i++)
    {
        s += z1.at(i) * (u / d);
        u *= 4.0;
        d *= 5.0;
    }
    s = s / 5.0;
    cout << s << '\n';
    ld v, sf = 0;
    for (int i = 0; i < ts; i++)
    {
        u = 4.0;
        d = 5.0;
        for (int p = 0; p < ts; p++)
        {
            if (p != i)
            {
                s = z1.at(p);
                v = p;
                break;
            }
        }
        for (int w = 0; w < ts; w++)
        {
            if (w != i && w != v)
            {
                s += z1.at(w) * (u / d);
                u *= 4.0;
                d *= 5.0;
            }
        }

        sf += s;
    }
    sf = sf / ts;
    sf = sf / 5;
    cout << sf << endl;
    return 0;
}