n=int(input())
a=list(map(int,input().split()))
dp=[[0]*20001 for i in range(n+1)]
dp[0][0]=1
mod=998244353
for i in range(n):
    for j in range(-10000,10000):
        dp[i+1][j+a[i]]+=dp[i][j]
        dp[i+1][j-a[i]]+=dp[i][j]
        dp[i+1][j+a[i]]%=mod
        dp[i+1][j-a[i]]%=mod
ans=0
for i in range(-10000,10001):
    ans+=abs(i)*dp[n][i]
    ans%=mod
print(ans)