#include <bits/stdc++.h>

using namespace std;
using llong = long long;
using ldbl = long double;
using P = pair<llong, llong>;

#define BE(x) x.begin(), x.end()

const llong inf = llong(1e18)+7;
const llong mod = 1e9+7;

llong nCr[100001] = {};

void getnCr(llong N){
	nCr[0] = 1;
	for(int i = 1; i <= N; i++){
		nCr[i] = nCr[i-1];
		nCr[i] *= (N-i+1);
		nCr[i] /= i;
		nCr[i] %= mod;
	}

	return;
}

int main(){
	llong N;
	vector<llong> a;

	cin >> N;
	a.resize(N);
	for(int i = 0; i < N; i++)
		cin >> a[i];

	getnCr(N-1);
	llong ans = 0;
	for(int i = 0; i < N; i++){
		(ans += nCr[i]*a[i]) %= mod;
	}

	cout << ans << endl;

	return 0;
}