#! usr/bin/env python
# -*- coding: utf-8 -*utf-8


def main():
    N = int(input())
    A = list(map(int, input().split()))
    MOD = 10 ** 9 + 7
    
    fact = [1] * (N+1)
    fact_inv = [1] * (N+1)
    
    for i in range(1, N+1):
        fact[i] = fact[i-1] * i % MOD
        
    fact_inv[N] = pow(fact[N], MOD-2, MOD)
    
    for i in range(N-1, 0, -1):
        fact_inv[i] = fact_inv[i+1] * (i+1) % MOD
        
    ans = 0
    for i in range(N):
        ans += fact[N-1] * fact_inv[i] % MOD * fact_inv[N-i-1] * A[i] % MOD
        ans %= MOD
        
    print(ans)
    
    
if __name__ == '__main__':
    main()