# coding: utf-8
# Your code here!
import sys
read = sys.stdin.read
readline = sys.stdin.readline

n,*a = map(int,read().split())
b = [0]*n

MOD = 10**9+7
b[0] = 1
for i in range(n-1):
    b[i+1] = b[i]*(n-1-i) % MOD
    b[i+1] *= pow(i+1,MOD-2,MOD)
    b[i+1] %= MOD
    
#print(b)
print(sum(ai*bi for ai,bi in zip(a,b))%MOD)