#include <iostream>

using namespace std;
typedef long long ll;
ll mod = 1000000007,inv[200010],fact[200010],fi[200010];
void inverse(){
	int i;
	inv[1] = 1;
	for(i=2;i<200010;i++){
		inv[i] = mod - (mod/i)*inv[mod%i]%mod;
	}
	fact[0] = fi[0] = 1;
	for(i=1;i<200010;i++){
		fact[i] = fact[i-1]*i%mod;
		fi[i] = (fi[i-1]*inv[i])%mod;
	}
}

ll comb(int n,int k){
	if(n<0 || k<0 || n<k) return 0;
	return fact[n]%mod*fi[k]%mod*fi[n-k]%mod;
}

ll ans = 0;
int main(){
	int i,n;
	cin >> n;
	inverse();
	for(i=0;i<n;i++){
		ll a; cin >> a;
		(ans += comb(n-1,i)*a%mod) %= mod;
	}
	cout << ans << endl;
}