from collections.abc import Iterable


def accum_dp1(xs: Iterable, f, op, e: int, size: int, init: Iterable, *, is_reset=True):
    dp = [e] * size
    for i, v in init:
        dp[i] = v

    for x in xs:
        pp = [e] * size if is_reset else dp.copy()
        dp, pp = pp, dp
        for i in range(size):
            for p, v in f(i, pp[i], x):
                if 0 <= p < size:
                    dp[p] = op(dp[p], v)

    return dp


MOD = 998244353
N = int(input())
A = list(map(int, input().split()))


def f(i, v, x):
    return [(i-x, v), (i+x, v)]


def op(a, b):
    return (a + b) % MOD


size = 10010
offset = size // 2
dp = accum_dp1(A, f, op, 0, size, [(offset, 1)])

ans = 0
for i in range(size):
    x = i - offset
    ans += abs(x) * dp[i]
    ans %= MOD

print(ans)