import collections,sys,math,functools,operator,itertools,bisect,heapq,decimal,string,time,random
#sys.setrecursionlimit(10**9)
#sys.set_int_max_str_digits(0)
#input = sys.stdin.readline
n = int(input())
alist = list(map(int,input().split()))
#alist = []
#s = input()
#n,m = map(int,input().split())
#for i in range(n):
#    alist.append(list(map(int,input().split())))
dp = [[0 for i in range(100001)] for j in range(n)]
sumdp = []
mod = 998244353
for i in range(n):
    if i == 0:
        for j in range(100001):
            if alist[i]+j <= 100000:
                dp[i][j] = 1
    else:
        for j in range(100001):
            if alist[i]+j > 100000:
                continue
            if 0 <= min(j,j-alist[i-1]+alist[i]) <= 100000:
                dp[i][j] = sumdp[-1][min(j,j-alist[i-1]+alist[i])]
                dp[i][j] %= mod
    sumdp.append(list(itertools.accumulate(dp[i],func=lambda x,y:(x+y)%mod)))
ans = 0
for i in range(100001):
    if i + alist[-1] <= 100000:
        ans += dp[-1][i]
        ans %= mod
        #print(dp[-1][i],i)
print(ans)