from collections import defaultdict as dd
MOD = 998244353

n = int(input())
alst = list(map(int, input().split()))
dp = dd(int)
dp[0] = 1

for a in alst:
    dp2 = dd(int)
    for k, v in dp.items():
        dp2[k - a] += v
        dp2[k + a] += v
        dp2[k - a] %= MOD
        dp2[k + a] %= MOD
    dp = dp2
            
ans = 0
for k, v in dp.items():
    ans += abs(k) * v
    ans %= MOD
print(ans)