#include <bits/stdc++.h>
using namespace std;
#pragma GCC optimize("Ofast")
#pragma GCC optimize ("unroll-loops")
#pragma GCC target("sse,sse2,sse3,ssse3,sse4,popcnt,abm,mmx,avx,tune=native")
#define mod 1000000007
#define pb emplace_back
#define mp make_pair
#define fi first
#define sec second
typedef long long ll;
typedef long double  ld;
#define pii pair<ll,ll> 
#define vi vector< ll > 
#define vvi vector< vi > 
#define vpi vector< pii > 
#define vvpi vector< vpi > 
#define fast ios_base::sync_with_stdio(false);cin.tie(0);cout.tie(0)
#define test(t) ll t;cin>>t;while(t--)
#define mem(a,b) memset(a,b,sizeof(a))
#define inn freopen("input.txt", "r", stdin)
#define outt freopen("output.txt", "w", stdout)
#define all(arr) arr.begin(),arr.end()
#define fr(i,n) for(ll i=0;i<(n);++i)
#define rep(i,a,b) for(ll i=a;i<=b;++i)
#define per(i,a,b) for(ll i=a;i>=b;i--)
#define remin(a,b) (a=min((a),(b)))
#define remax(a,b) (a=max((a),(b)))
#ifndef ONLINE_JUDGE
#define debarr(a,n) cerr<<#a<<" : ";for(int i=0;i<n;i++) cerr<<a[i]<<" "; cerr<<endl;
#define debmat(mat,row,col) cerr<<#mat<<" :\n";for(int i=0;i<row;i++) {for(int j=0;j<col;j++) cerr<<mat[i][j]<<" ";cerr<<endl;}
#define pr(...) dbs(#__VA_ARGS__, __VA_ARGS__)
template <class S, class T>ostream& operator <<(ostream& os, const pair<S, T>& p) {return os << "(" << p.first << ", " << p.second << ")";}
template <class T>ostream& operator <<(ostream& os, const vector<T>& p) {os << "[ "; for (auto& it : p) os << it << " "; return os << "]";}
template <class T>ostream& operator <<(ostream& os, const unordered_set<T>& p) {os << "[ "; for (auto& it : p) os << it << " "; return os << "]";}
template <class S, class T>ostream& operator <<(ostream& os, const unordered_map<S, T>& p) {os << "[ "; for (auto& it : p) os << it << " "; return os << "]";}
template <class T>ostream& operator <<(ostream& os, const set<T>& p) {os << "[ "; for (auto& it : p) os << it << " "; return os << "]";}
template <class T>ostream& operator <<(ostream& os, const multiset<T>& p) {os << "[ "; for (auto& it : p) os << it << " "; return os << "]";}
template <class S, class T>ostream& operator <<(ostream& os, const map<S, T>& p) {os << "[ "; for (auto& it : p) os << it << " "; return os << "]";}
template <class T> void dbs(string str, T t) {cerr << str << " : " << t << "\n";}
template <class T, class... S> void dbs(string str, T t, S... s) {int idx = str.find(','); cerr << str.substr(0, idx) << " : " << t << ","; dbs(str.substr(idx + 1), s...);}
template <class T> void prc(T a, T b) {cerr << "["; for (T i = a; i != b; ++i) {if (i != a) cerr << ", "; cerr << *i;} cerr << "]\n";}
#else
#define pr(...) {}
#define debarr(a,n) {}
#define debmat(mat,row,col) {}
#endif
ll power(ll x,ll y){ll res = 1;while(y){if(y&1) res = (res*x)%mod;y=y/2,x=(x*x)%mod;}return res%mod;}
map < pair < pii , pii >  , ll > dp;
ll arr[18];
ll func(ll x,ll y,ll a,ll b)
{
    if(y-x<=1)
        return 0;
    if(dp.find(mp(mp(x,y),mp(a,b)))!=dp.end())
        return dp[mp(mp(x,y),mp(a,b))];
    ll ret = 1e18;
    ll i;
    for(i=x+1;i<y;i++)
    {
        ret = min(ret,func(x,i,a,a+b)+func(i,y,a+b,b)+(a+b)*arr[i]);
    }
    return dp[mp(mp(x,y),mp(a,b))]=ret;
}
signed main()
{
    fast;
    ll i,n;
    cin>>n;
    for(i=0;i<n;i++)
        cin>>arr[i];
    cout<<func(0,n-1,1,1)+arr[0]+arr[n-1];
}


Measured memory_bytes: 20608