import sys
sys.setrecursionlimit(20000000)
input = sys.stdin.readline
n = int(input())
a = list(map(int,input().split()))
mod = 10**9+7
fact = [1]*(n+n+1)
rfact = [1]*(n+n+1)
for i in range(n+n):
    fact[i+1] = rr = ((i+1) * fact[i]) % mod
    rfact[i+1] = pow(rr, mod-2, mod)
def comb(N, K,mod):
    return fact[N] * rfact[K] * rfact[N-K] % mod
ans = 0
for i in range(n):
        ans += comb(n-1,i,mod)*a[i]
        ans %= mod
print(ans)