#include <iostream>
#include <set>
#include <queue>
#include <stack>
#include <vector>
#include <algorithm>
#include <map>
#include <chrono>
#include <math.h>
using namespace std;

using lli = long long int;
using Vint = std::vector<int>;
using Vlli = std::vector<lli>;
using Wint = std::vector<Vint>;
using Wlli = std::vector<Vlli>;
using Vbool = std::vector<bool>;
using pii = std::pair<int, int>;
using pll = std::pair<lli, lli>;

constexpr int MOD = 1e9 + 7;
constexpr int INFi = 2e9 + 1;
constexpr lli INFl = (lli)(9e18) + 1;
const vector<pii> DXDY = {std::make_pair(1, 0), std::make_pair(-1, 0), std::make_pair(0, 1), std::make_pair(0, -1)};
constexpr char BR = '\n';

#define FOR(i, a, b) for(int (i) = (a); (i) < (b); (i)++)
#define FOReq(i, a, b) for(int (i) = (a); (i) <= (b); (i)++)
#define rFOR(i, a, b) for(int (i) = (b); (i) >= (a); i--)
#define FORstep(i, a, b, step) for(int (i) = (a); i < (b); i += (step))
#define REP(i, n) FOR(i, 0, n)
#define rREP(i, n) rFOR(i, 0, (n-1))
#define vREP(ele, vec) for(auto &(ele) : (vec))
#define vREPcopy(ele, vec) for(auto (ele) : (vec))
#define SORT(A) std::sort((A).begin(), (A).end())



template <class T> inline int argmin(vector<T> vec){return min_element(vec.begin(), vec.end()) - vec.begin();}
template <class T> inline int argmax(vector<T> vec){return max_element(vec.begin(), vec.end()) - vec.begin();}
template <class T> inline void chmax(T &a, T b){a = max(a, b);}
template <class T> inline void chmin(T &a, T b){a = min(a, b);}
inline int toInt(string &s){int res = 0; for(char a : s) res = 10 * res + (a - '0'); return res;}
inline int toInt(const string s){int res = 0; for(char a : s) res = 10 * res + (a - '0'); return res;}
inline long long int toLong(string &s){lli res = 0; for(char a : s) res = 10 * res + (a - '0'); return res;}
inline long long int toLong(const string s){lli res = 0; for(char a : s) res = 10 * res + (a - '0'); return res;}
template <class T> inline std::string toString(T n){
  if(n == 0) return "0";
  std::string res = "";
  if(n < 0){n = -n;while(n != 0){res += (char)(n % 10 + '0'); n /= 10;}
  std::reverse(res.begin(), res.end()); return '-' + res;}
  while(n != 0){res += (char)(n % 10 + '0'); n /= 10;} std::reverse(res.begin(), res.end()); return res;
}

// ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~




class Combination_Mod{
  private:
    int n, mod;
    vector<long long int> S, T;
    long long int power(long long int a, int index){
      if(index == 0) return 1;
      if(index % 2 == 0) return power((a * a) % mod, index / 2);
      return (a * power((a * a) % mod, index / 2)) % mod;
    }
    long long int calculate_inv(int a){
      return power(a, mod - 2);
    }
    void init_S(void){
      S.at(0) = 1;
      for(int i = 1; i <= n; i++) S.at(i) = (S.at(i - 1) * i) % mod;
    }
    void init_T(void){
      T.at(0) = 1;
      for(int i = 1; i <= n; i++) T.at(i) = calculate_inv(S.at(i));
    }
  public:
    Combination_Mod(int nn, int modmod){
      n = nn;
      mod = modmod;
      S.resize(nn + 1); T.resize(nn + 1);
      init_S(); init_T();
    }
    ~Combination_Mod(void){};
    long long int nCr(int nn, int rr){
      return ((S.at(nn) * T.at(rr) % mod) * T.at(nn - rr)) % mod;
    }
};


int main(void){
  // a1, a2, ..., a_n
  // ans = ∑ (n-1)_C_k * a_k
  int n; scanf("%d\n", &n);
  lli res = 0;
  Vint A(n); vREP(ele, A) scanf("%d", &ele);
  Combination_Mod C(n, MOD);
  REP(i, n) res = (res + (C.nCr(n-1, i) * A.at(i) % MOD)) % MOD;
  printf("%lld\n", res);
  return 0;
}