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

#define modulo 1000000007
#define mod(x) (((long long)x)%modulo)


struct combi{
	deque<int> kaijou;
	deque<int> kaijou_;
	
	void kaijou_set(int n){
		kaijou.push_back(1);
		for(int i=1;i<=n;i++){
			kaijou.push_back(mod(kaijou[i-1]*i));
		}
		int a = kaijou[n];int b = 1;int m = modulo-2;
		while(m!=0){
			if(m%2){
				b=mod(b*a);
			}
			a=mod(a*a);
			m/=2;
		}
		kaijou_.push_front(b);
		for(int i=1;i<=n;i++){
			int k=n+1-i;
			kaijou_.push_front(mod(kaijou_[0]*k));
		}
	}
	
	int combination(int n,int r){
		if(r>n)return 0;
		int a = mod(kaijou[n]*kaijou_[r]);
		a=mod(a*kaijou_[n-r]);
		return a;
	}
	
	int junretsu(int a,int b){
		int x = mod(kaijou_[a]*kaijou_[b]);
		x=mod(x*kaijou[a+b]);
		return x;
	}
	
};


int main(){
	int N;
	cin>>N;
	int a[N];
	for(int i=0;i<N;i++){
		cin>>a[i];
	}
	combi c;
	c.kaijou_set(100001);
	
	int ans = 0;
	for(int i=0;i<N;i++){
		int x = mod(c.combination(N-1,i)*a[i]);
		ans=mod(ans+x);
	}
	
	cout<<ans<<endl;
	
	return 0;
}