from collections import *

N = int(input())
A = list(map(int, input().split()))
dp = defaultdict(int)
dp[0] = 1
MOD = 998244353

for Ai in A:
    ndp = defaultdict(int)
    
    for k in dp:
        ndp[k+Ai] += dp[k]
        ndp[k+Ai] %= MOD
        ndp[k-Ai] += dp[k]
        ndp[k-Ai] %= MOD

    dp = ndp

ans = 0

for k, v in dp.items():
    ans += abs(k)*v%MOD
    ans %= MOD

print(ans)