def main():
    N = int(input()); MOD = 998244353
    A = list(map(int,input().split()))
    MAX = 2*pow(10,4) + 1
    dp = [0]*MAX
    #dp[i]; i + 10000が何通りあるか
    base = 10000
    dp[0 + 10000] = 1
    for i in range(N):
        p = [0]*MAX
        dp,p = p,dp
        for j in range(MAX):
            #+
            val = j + A[i]
            if 0 <= val < MAX:
                dp[val] += p[j]
            #-
            val = j - A[i]
            if 0 <= val < MAX:
                dp[val] += p[j]
            dp[val] %= MOD
    ans = 0
    for j in range(MAX):
        val = abs(j - base)
        ans += val*dp[j]
        ans %= MOD
    print(ans)

if __name__ == '__main__':
    main()