from collections import defaultdict

n = int(input())
A = list(map(int, input().split()))
mod = 998244353

ans = 0
DP = defaultdict(int)
for a in A:
    DP[a] += DP[a - 1] + 1
    DP[a] %= mod
for cnt in DP.values():
    ans += cnt
    ans %= mod
ans -= n
ans %= mod
print(ans)