import sys
input = sys.stdin.readline

mod=998244353

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

DP=[0]*100001

for i in range(A[0],100001):
    DP[i]=1

for j in range(1,N):
    a=A[j]
    b=A[j-1]
    NDP=[0]*100001

    for i in range(100001):
        if DP[i]>=0:
            k=i-b

            # 真のスコア: i以上
            # 仮のスコア: k以上

            MIN=max(i,k+a)
            if MIN<=100000:
                NDP[MIN]+=DP[i]

    for i in range(1,100001):
        NDP[i]=(NDP[i]+NDP[i-1])%mod

    DP=NDP

print(sum(DP)%mod)