import sys
input = sys.stdin.readline

N = int(input())
P = list(map(int, input().split()))
iP = [(i, P[i]) for i in range(N)]
iP.sort(key=lambda t: t[1])
l, r = iP[0][0], iP[0][0]
ans = 1
MOD = 998244353

for i in range(1, N):
    idx = iP[i][0]
    
    if idx<l:
        l = idx
    elif idx>r:
        r = idx
    else:
        ans *= r-l+1-i
        ans %= MOD

print(ans)