from collections import defaultdict
N=int(input())
A=list(map(int,input().split()))
d=defaultdict(int)
cnt=defaultdict(int)
mod=998244353
for i in range(N):
    cnt[A[i]]+=1
    cnt[A[i]]%=mod
    d[A[i]]+=d[A[i]-1]+cnt[A[i]-1]
    d[A[i]]%=mod
print(sum(d.values())%mod)