import sys sys.setrecursionlimit(10**7) def I(): return int(sys.stdin.readline().rstrip()) def MI(): return map(int,sys.stdin.readline().rstrip().split()) def LI(): return list(map(int,sys.stdin.readline().rstrip().split())) def LI2(): return list(map(int,sys.stdin.readline().rstrip())) def S(): return sys.stdin.readline().rstrip() def LS(): return list(sys.stdin.readline().rstrip().split()) def LS2(): return list(sys.stdin.readline().rstrip()) def factorial(N,p): # 0!~N!(mod p) のリスト res = [0]*(N+1) res[0] = 1 for i in range(1,N+1): res[i] = (res[i-1]*i) % p return res def factorial_inverse(N,p): # 0!~N!(mod p) の逆元のリスト fac = factorial(N,p) res = [0]*(N+1) a = pow(fac[-1],p-2,p) for i in range(N,-1,-1): res[i] = a a *= i a %= p return fac,res N = I() A = LI() mod = 10**9+7 fac,fac_inv = factorial_inverse(N-1,mod) ans = 0 for i in range(N): ans += fac[N-1]*fac_inv[i]*fac_inv[N-1-i]*A[i] ans %= mod print(ans)