//include
//------------------------------------------
#include <vector>
#include <list>
#include <map>
#include <unordered_map>
#include <climits>
#include <set>
#include <unordered_set>
#include <deque>
#include <stack>
#include <bitset>
#include <algorithm>
#include <functional>
#include <numeric>
#include <utility>
#include <sstream>
#include <iostream>
#include <iomanip>
#include <cstdio>
#include <cmath>
#include <cstdlib>
#include <cctype>
#include <string>
#include <cstring>
#include <ctime>
#include <queue>
#include <random>
#include <chrono>
#include <complex>
#include <regex>
#include <locale>
#include <random>
#include <cassert>
#include <type_traits>

using namespace std;

// typedef
//------------------------------------------
typedef long long LL;
typedef vector<int> VI;
typedef vector<bool> VB;
typedef vector<char> VC;
typedef vector<double> VD;
typedef vector<string> VS;
typedef vector<LL> VLL;
typedef vector<VI> VVI;
typedef vector<VB> VVB;
typedef vector<VS> VVS;
typedef vector<VLL> VVLL;
typedef vector<VVI> VVVI;
typedef vector<VVLL> VVVLL;
typedef pair<int, int> PII;
typedef pair<LL, LL> PLL;
typedef pair<int, string> PIS;
typedef pair<string, int> PSI;
typedef pair<string, string> PSS;
typedef vector<PII> VPII;
typedef vector<PLL> VPLL;
typedef vector<VPII> VVPII;
typedef vector<VPLL> VVPLL;
typedef vector<VS> VVS;
typedef map<int, int> MII;
typedef map<LL, LL> MLL;
typedef map<string, int> MSI;
typedef map<int, string> MIS;

// container util
//------------------------------------------

#define ALL(a)  (a).begin(),(a).end()
#define SZ(a) int((a).size())
#define EACH(i, arr) for(typeof((arr).begin()) i=(arr).begin(); i!=(arr).end(); ++i)
#define EXIST(str, e) ((str).find(e)!=(str).end())
#define COUNT(arr, v) count((arr).begin(), (arr).end(), v)
#define SEARCH(v, w) search((v).begin(), (v).end(), (w).begin(), (w).end())
#define SORT(c) sort((c).begin(),(c).end())
#define RSORT(c) sort((c).rbegin(),(c).rend())
#define REVERSE(c) reverse((c).begin(), (c).end())
#define ROTATE_LEFT(arr, c) rotate((arr).begin(), (arr).begin()+(c), (arr).end())
#define ROTATE_RIGHT(arr, c) rotate((arr).rbegin(), (arr).rbegin() + (c), (arr).rend())
#define SUMI(arr) accumulate((arr).begin(), (arr).end(), 0)
#define SUMD(arr) accumulate((arr).begin(), (arr).end(), 0.)
#define SUMLL(arr) accumulate((arr).begin(), (arr).end(), 0LL)
#define MULD(arr) accumulate((arr).begin(), (arr).end(), 1., multiplies<double>())
#define UB(arr, n) upper_bound((arr).begin(), (arr).end(), n)
#define LB(arr, n) lower_bound((arr).begin(), (arr).end(), n)
#define PB push_back
#define MP make_pair
#define ft first
#define sd second


// input output
//------------------------------------------
#define GL(s) getline(cin, (s))
#define INIT() std::ios::sync_with_stdio(false);std::cin.tie(0)
#define OUT(d) std::cout<<(d)
#define OUT_L(d) std::cout<<(d)<<endl
#define FOUT(n, data) std::cout<<std::fixed<<std::setprecision(n)<<(data)
#define FOUT_L(n, data) std::cout<<std::fixed<<std::setprecision(n)<<(data)<<"\n"
#define EL() printf("\n")
#define SHOW_VECTOR(v) {std::cerr << #v << "\t:";for(const auto& xxx : v){std::cerr << xxx << " ";}std::cerr << "\n";}
#define SHOW_MAP(v) {std::cerr << #v << endl; for(const auto& xxx: v){std::cerr << xxx.first << " " << xxx.second << "\n";}}
#define Yes() printf("Yes\n")
#define No() printf("No\n")
#define YES() printf("YES\n")
#define NO() printf("NO\n")
#define Yay() printf("Yay!\n")
#define Nnn() printf(":(\n")
#define CE(x, y) ((x + y - 1) / (y))


template<typename T1, typename T2>
istream &operator>>(istream &in, pair<T1, T2> &p) {
    in >> p.first >> p.second;
    return in;
}

template<typename T>
istream &operator>>(istream &in, vector<T> &v) {
    for (auto &x: v)
        in >> x;
    return in;
}


template<typename T1, typename T2>
ostream &operator<<(ostream &out, const std::pair<T1, T2> &p) {
    out << "[" << p.first << ", " << p.second << "]" << "\n";
    return out;
}

template<class T1, class T2>
inline bool chmin(T1 &a, T2 b) {
    if (a > b) {
        a = b;
        return true;
    }
    return false;
}

template<class T1, class T2>
inline bool chmax(T1 &a, T2 b) {
    if (a < b) {
        a = b;
        return true;
    }
    return false;
}


//repetition
//------------------------------------------
#define FOR(i, a, b) for(int i=(a);i<(b);++i)
#define RFOR(i, a, b) for(int i=(b)-1;i>=(a);--i)
#define REP(i, n)  FOR(i,0,n)
#define RREP(i, n) for(int i = n-1;i >= 0;i--)
#define FORLL(i, a, b) for(LL i=LL(a);i<LL(b);++i)
#define RFORLL(i, a, b) for(LL i=LL(b)-1;i>=LL(a);--i)
#define REPLL(i, n) for(LL i=0;i<LL(n);++i)
#define RREPLL(i, n) for(LL i=LL(n)-1;i>=0;--i)
#define FOREACH(x, arr) for(auto &(x) : (arr))

// Option + Control + K  Terminal
// Command + Control + K    Run
// Command + b   EOF



//------------------------------------------
//------------------------------------------

template<typename T>
class CulSum {
private:
    long long N;
    vector<T> a;
    vector<T> aa;
    vector<T> b;
    vector<T> bb;

    function<T(T, T)> func;

public:

    /// @param a original array
    CulSum(vector<T> _a) {
        N = _a.size();
        a = _a;
        b = _a;
        reverse(b.begin(), b.end());
        this->aa = vector<T>(N + 1, T{});
        this->bb = vector<T>(N + 1, T{});
        for (int i = 0; i < N; i++) aa[i + 1] = a[i] + aa[i];
        for (int i = 0; i < N; i++) bb[i + 1] = b[i] + bb[i];
    }

    /// @param a original array
    CulSum(vector<T> _a, function<T(T, T)> func) : func(func) {
        N = _a.size();
        a = _a;
        b = _a;
        reverse(b.begin(), b.end());
        this->aa = vector<T>(N + 1, T{});
        this->bb = vector<T>(N + 1, T{});
        for (int i = 0; i < N; i++) aa[i + 1] = func(a[i], aa[i]);
        for (int i = 0; i < N; i++) bb[i + 1] = func(b[i], bb[i]);
    }

    /// @brief 0-index original
    /// @param l original close
    /// @param r original open
    T get_sum(int l, int r) {
        return aa[r] - aa[l];
    }

    /// @brief 0-index original
    /// @param l original close
    /// @param r original open
    T get_sum_reverse(int l, int r) {
        l = N - l;
        r = N - r;
        return bb[l] - bb[r];
    }

    /// @brief 0-index original
    /// @param k length
    T get_sum_lead_k_len(int k) {
        return get_sum(0, k);
    }

    /// @brief 0-index original
    /// @param k length
    T get_sum_tail_k_len(int k) {
        return get_sum_reverse(N - k, N);
    }

    void show() {
        for (int i = 0; i < N + 1; i++) cout << aa[i] << " ";
        cout << endl;
    }

    void show_reverse() {
        for (int i = N; i >= 0; i--) cout << bb[i] << " ";
        cout << endl;
    }

};

int main() {

    LL N;
    cin >> N;

    VLL A(N + 1);
    cin >> A;

    CulSum<LL> B(A);

    VLL dp(N + 1, 0);
    dp[0] = 1;

    LL ans = 0;
    for (int i = 0; i < N; i++) {
        ans += dp[i];
        if (dp[i] < A[i]) {
            cout << -1 << endl;
            return 0;
        }
        if (dp[i] == A[i]) {
            dp[i] -= A[i];
            continue;
        }
        dp[i] -= A[i];

        LL ok = -1;
        LL ng = dp[i] + 1;
        while (abs(ok - ng) > 1) {
            LL mid = (ok + ng) / 2;
            bool isGood = [&]() {
                return mid * 2 + max(0LL, (dp[i] - mid)) <= B.get_sum(i + 1, N + 1);
            }();
            if (isGood) ok = mid;
            else ng = mid;
        }

        dp[i + 1] += 2 * ok;
        dp[i] -= ok;
        dp[i + 1] += dp[i];
    }

    if (A.back() != dp.back()) {
        cout << -1 << endl;
        return 0;
    }

    ans += dp.back();
    cout << ans << endl;

}






























































Measured memory_bytes: 8076