from functools import cache


def COMinit(upper: int,
            mod_: int) -> tuple[list[int],
                                list[int],
                                list[int]]:

    fac = [0 for _ in range(upper)]
    finv = [0 for _ in range(upper)]
    inv = [0 for _ in range(upper)]
    fac[0] = 1
    fac[1] = 1
    finv[0] = 1
    finv[1] = 1
    inv[1] = 1

    for i in range(2, upper):
        fac[i] = (fac[i - 1] * i)
        fac[i] %= mod_
        inv[i] = mod_ - inv[mod_ % i] * (mod_ // i)
        inv[i] %= mod_
        finv[i] = finv[i - 1] * inv[i]
        finv[i] %= mod_

    return fac, finv, inv


def main():
    N = int(input())
    a = list(map(int, input().split()))
    MOD = int(1e9 + 7)

    fac, finv, inv = COMinit(N + 20, MOD)
    c_sum = 0

    @cache
    def com(n: int, k: int) -> int:
        if n < k:
            return 0
        if (n < 0 or k < 0):
            return 0

        return (fac[n] * finv[k] * finv[n - k]) % MOD
    for k in range(N):
        c_sum += com(N - 1, k) * a[k]
        c_sum %= MOD
    print(c_sum)


if __name__ == "__main__":
    main()