M=10**9+7
N=int(input())

F=[1]
for i in range(1,N+1):
    F.append((F[-1]*i)%M)

G=[0]*(N+1)
G[N]=pow(F[N],M-2,M)

for i in range(N-1,-1,-1):
    G[i]=(G[i+1]*(i+1))%M

def nCr(n,r):
    if r<0 or n<r:
        return 0
    else:
        return (F[n]*G[r]*G[n-r])%M

A=list(map(int,input().split()))
S=0

for i in range(N):
    S=(S+A[i]*nCr(N-1,i))%M

print(S)