#include<bits/stdc++.h>
using namespace std;
#define inf 1000000000
#define INF 1000000000000000
#define ll long long
#define ull unsigned long long
#define M (int)(1e9+7)
#define P pair<int,int>
#define PLL pair<ll,ll>
#define FOR(i,m,n) for(int i=(int)m;i<(int)n;i++)
#define RFOR(i,m,n) for(int i=(int)m;i>=(int)n;i--)
#define rep(i,n) FOR(i,0,n)
#define rrep(i,n) RFOR(i,n,0)
#define all(a) a.begin(),a.end()
#define IN(a,n) rep(i,n){ cin>>a[i]; }
const int vx[4] = {0,1,0,-1};
const int vy[4] = {1,0,-1,0};
#define PI 3.14159265
#define F first
#define S second
#define PB push_back
#define EB emplace_back
#define int ll
void init(){
  cin.tie(0);
  ios::sync_with_stdio(false);
}




int fac[310000];

int inv(int x){
  if(x==1) return 1;
  return (M-M/x)*inv(M%x)%M;
}


int comb(int n,int k){
  int x=(fac[k]*fac[n-k])%M;
  return (fac[n]*inv(x))%M;
}

int fac_init(int n){
  fac[0]=1;
  FOR(i,1,n+1){
    fac[i]=fac[i-1]*i;
    fac[i]%=M;
  }
  return 0;
}

main(){
  int n;
  cin>>n;
  fac_init(n);

  int ans=0;
  rep(i,n){
    int a;
    cin>>a;
    ans+=(a*comb(n-1,i))%M;
    ans%=M;
  }

  cout<<ans<<endl;

}