#include <bits/stdc++.h>
#define ft first
#define sc second
#define lb lower_bound
#define ub upper_bound
#define pb push_back
#define pt(sth) cout << sth << "\n"
#define chmax(a, b) {if(a<b) a=b;}
#define chmin(a, b) {if(a>b) a=b;}
#define moC(a, s, b) (a)=((a)s(b)+MOD)%MOD
using namespace std;
typedef long long ll;
typedef pair<ll, ll> P;
static const ll INF=1e18;
static const ll MAX=1e5+7;
static const ll MOD=1e9+7;

ll moP(ll x, ll n) {
  ll res=1;
  while(n>0) {
    if(n&1) moC(res, *, x);
    moC(x, *, x);
    n>>=1;
  }
  return res;
}

ll fa[MAX], rfa[MAX];
ll C(ll n, ll k) {
  if(k==0) return 1;
  if(n==k) return 1;
  else return fa[n]*rfa[k]%MOD*rfa[n-k]%MOD;
}

int main(void) {
  ll N;
  cin >> N;
  ll a[MAX];
  ll i;
  
  fa[0]=1;
  for(i=1; i<=N; i++) {
    fa[i]=i*fa[i-1]%MOD;
    rfa[i]=moP(fa[i], MOD-2);
  }
  
  for(i=0; i<N; i++)
    cin >> a[i];
  
  
  ll ans=0;
  for(i=0; i<N; i++)
    moC(ans, +, (C(N-1, i)*a[i])%MOD);
  
  pt(ans);
}