MOD = 998244353

n = int(input())
P = list(map(int, input().split()))
pos = [-1] * n
for i, p in enumerate(P):
    pos[p] = i
    
ans = 1
l = n
r = -1
for i, p in enumerate(pos):
    if l <= p <= r:
        ans *= r - l - i + 1
        ans %= MOD
    else:
        l = min(l, p)
        r = max(r, p)
print(ans)