import sys
input = sys.stdin.readline

mod=998244353

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

D={0:1}

for a in A:
    ND=dict()

    for d in D:
        if d+a in ND:
            ND[d+a]+=D[d]
        else:
            ND[d+a]=D[d]

        if d-a in ND:
            ND[d-a]+=D[d]
        else:
            ND[d-a]=D[d]

    D=ND
    
ANS=0
for d in D:
    ANS=(ANS+abs(d)*D[d])%mod

print(ANS)