from collections import Counter
import sys
input = lambda: sys.stdin.readline().rstrip()
ii = lambda: int(input())
mi = lambda: map(int, input().split())
li = lambda: list(mi())
inf = 2 ** 63 - 1
mod = 998244353


n = ii()

a = li()

dp = Counter()

for v in a:
    dp[v] += 1
    dp[v] += dp[v - 1]
    dp[v] %= mod
ans = -n
for v, c in dp.items():
    ans += c
    ans %= mod
print(ans)