#include<bits/stdc++.h>
using namespace std;
#pragma GCC optimize("Ofast")

#define rep(i,n) for(ll i=0;i<n;i++)
#define repl(i,l,r) for(ll i=(l);i<(r);i++)
#define per(i,n) for(ll i=(n)-1;i>=0;i--)
#define perl(i,r,l) for(ll i=r-1;i>=l;i--)
#define fi first
#define se second
#define pb push_back
#define ins insert
#define pqueue(x) priority_queue<x,vector<x>,greater<x>>
#define all(x) (x).begin(),(x).end()
#define CST(x) cout<<fixed<<setprecision(x)
#define vtpl(x,y,z) vector<tuple<x,y,z>>
#define rev(x) reverse(x);
using ll=long long;
using vl=vector<ll>;
using vvl=vector<vector<ll>>;
using pl=pair<ll,ll>;
using vpl=vector<pl>;
using vvpl=vector<vpl>;
const ll MOD=1000000007;
const ll MOD9=998244353;
const int inf=1e9+10;
const ll INF=4e18;
const ll dy[9]={1,0,-1,0,1,1,-1,-1,0};
const ll dx[9]={0,1,0,-1,1,-1,1,-1,0};
template<class T> inline bool chmin(T& a, T b) {
    if (a >= b) {
        a = b;
        return true;
    }
    return false;
}
template<class T> inline bool chmax(T& a, T b) {
    if (a < b) {
        a = b;
        return true;
    }
    return false;
}

int main(){
    ll n;cin >> n;
    vector<double> v(n);
    rep(i,n)cin >> v[i];
    double x=n*(n+1)/2;
    double y=accumulate(all(v),0);
    double x2=0;
    rep(i,n)x2+=(i+1)*(i+1);
    double xy=0;
    rep(i,n)xy+=(i+1)*v[i];
    double a=xy*n-x*y;a/=x2*n-x*x;
    double b=x2*y-xy*x;b/=x2*n-x*x;
    CST(10);
    cout << b+a<<" " << a << endl;
    double ans=0;
    double now=b+a;
    rep(i,n){
        ans+=(v[i]-now)*(v[i]-now);
        now+=a;
    }
    cout << ans << endl;
}