#include using namespace std; #define inf 1000000000 #define INF 1000000000000000 #define ll long long #define ull unsigned long long #define M (int)(1e9+7) #define P pair #define PLL pair #define FOR(i,m,n) for(int i=(int)m;i<(int)n;i++) #define RFOR(i,m,n) for(int i=(int)m;i>=(int)n;i--) #define rep(i,n) FOR(i,0,n) #define rrep(i,n) RFOR(i,n,0) #define all(a) a.begin(),a.end() #define IN(a,n) rep(i,n){ cin>>a[i]; } const int vx[4] = {0,1,0,-1}; const int vy[4] = {1,0,-1,0}; #define PI 3.14159265 #define F first #define S second #define PB push_back #define EB emplace_back #define int ll void init(){ cin.tie(0); ios::sync_with_stdio(false); } int fac[310000]; int inv(int x){ if(x==1) return 1; return (M-M/x)*inv(M%x)%M; } int comb(int n,int k){ int x=(fac[k]*fac[n-k])%M; return (fac[n]*inv(x))%M; } int fac_init(int n){ fac[0]=1; FOR(i,1,n+1){ fac[i]=fac[i-1]*i; fac[i]%=M; } return 0; } main(){ int n; cin>>n; fac_init(n); int ans=0; rep(i,n){ int a; cin>>a; ans+=(a*comb(n-1,i))%M; ans%=M; } cout<