#include <bits/stdc++.h>
using namespace std;

#define all(x) (x).begin(),(x).end()
#define SP <<" "<<
#define MOD 1000000007
#define IINF 1000000000
#define LINF 1000000000000000000

typedef long long LL;
typedef long double LD;

LL inv(LL x){
  LL p=MOD-2;
  LL ret=1;
  while(p){
    if(p&1) ret=ret*x%MOD;
    p>>=1;
    x=x*x%MOD;
  }
  return ret;
}

int main(){
  int n;
  cin >> n;
  vector<LL> a(n);
  for(int i=0;i<n;i++){
    cin >> a[i];
  }
  LL ans=a[0];
  LL c=1;
  for(LL i=1;i<n;i++){
    c=c*(n-i)%MOD*inv(i)%MOD;
    ans=(ans+a[i]*c)%MOD;
  }
  cout << ans << endl;
  return 0;
}