mod = 998244353
N = int(input())
P = list(map(int, input().split()))

ptoi = [0] * N
for i, p in enumerate(P):
    ptoi[p] = i

ans = 1
cnt = 1
L = R = ptoi[0]
for i in range(1, N):
    p = ptoi[i]
    if p < L or R < p:
        L = min(L, p)
        R = max(R, p)
    else:
        ans *= (R - L + 1) - cnt
        ans %= mod
    cnt += 1


print(ans)