MOD = 998244353
N = int(input())
P = list(map(int,input().split()))
if N == 1:
    print(1)
    exit()

Q = [0] * N
for i in range(N):
    Q[P[i]] = i
L,R = Q[:2]
if L > R:
    L,R = R,L

ans = 1
for i in range(2,N):
    if L < Q[i] and Q[i] < R:
        ans *= R + 1 - L - i
        ans %= MOD
    elif Q[i] < L:
        L = Q[i]
    else: #R < Q[i]:
        R = Q[i]

print(ans)