#include <bits/stdc++.h>
using namespace std;

typedef long long ll  ;

const int N = 1e5 + 10;

int main() {
    cin.tie(0);cin.sync_with_stdio(0);
    cout.tie(0);cout.sync_with_stdio(0);

    int n, k;
    cin>>n>>k;
    double mn= (n - k) * -3;
    double mx= (n - k) * 3;

    for(int i = 0; i < k; i++){
        int x; cin>>x;
        mn += x;
        mx += x;
    }

    cout<<fixed<<setprecision(10)<<mn / n<<" "<<mx / n<<"\n";
}