#include "bits/stdc++.h"

using namespace std;

const int MOD = 1e9 + 7;

#define MAX 100000
#define Rep(b, e, i) for (int i = b; i <= e; i++)
#define rep(n, i) Rep(0, n - 1, i)

typedef long long ll;

//階乗とその逆元
ll fac[MAX + 1], facInv[MAX + 1];

ll power(ll e, ll x)
{ //e^x % MOD
	if (x == 0)
		return 1LL;
	if (x % 2 != 0)
		return ((power(e, x - 1) * e) % MOD);
	ll temp = power(e, x / 2);
	return (temp * temp) % MOD;
}

ll nck(ll n, ll k)
{
	if (!(n >= k && k >= 0))
		return 0;
	ll temp = (fac[n] * facInv[n - k]) % MOD;
	return ((temp * facInv[k]) % MOD);
}

void fact(void)
{
	//階乗とその逆元
	fac[0] = facInv[0] = 1; //0! = 1
	//(x!)^(-1) ≡ (x!)^(p-2) (mod p)
	Rep(1, MAX, i) fac[i] = (fac[i - 1] * i) % MOD;
	facInv[MAX] = power(fac[MAX], MOD - 2);
	Rep(1, MAX - 1, i) facInv[MAX - i] = (facInv[MAX - i + 1] * (MAX - i + 1)) % MOD;
}

void solve()
{
	int N;
	cin >> N;
	long ans = 0;
	fact();
	for (int i = 0; i < N; i++)
	{
		long a;
		cin >> a;
		ans += nck(N-1, i) * a;
		ans %= MOD;
	}
	cout << ans << endl;
}

int main(void)
{
	solve();
	//cout << "yui(*-v・)yui" << endl;
	return 0;
}