from functools import cache
from atcoder.modint import ModContext, Modint
from collections import Counter
from math import factorial
import sys
from bisect import bisect_right
from itertools import count, accumulate


sys.setrecursionlimit(300000)


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) % mod_
        inv[i] = (mod_ - inv[mod_ % i] * (mod_ // i)) % mod_
        finv[i] = (finv[i - 1] * inv[i]) % mod_

    return fac, finv, inv


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

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

    @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
    seq_1 = 0
    for _ in range(N):
        seq_1 *= 10
        seq_1 += 1
        seq_1 %= MOD

    M_sum = 0
    for num, ctr_elm in enumerate(ctr, 1):
        if ctr_elm == 0:
            continue
        tmp_patterns = 1
        rest = N - 1
        for tmp_num, tmp_ctr_elm in enumerate(ctr, 1):
            if num == tmp_num:
                tmp_patterns *= com(rest, tmp_ctr_elm - 1)
                rest -= tmp_ctr_elm - 1
            else:
                tmp_patterns *= com(rest, tmp_ctr_elm)
                rest -= tmp_ctr_elm
        M_sum += tmp_patterns * seq_1 * num
        M_sum %= MOD
    print(M_sum)


if __name__ == "__main__":
    main()