import sys
#input = sys.stdin.readline
input = sys.stdin.buffer.readline

MOD = 998244353

def main():
    N = int(input()); INF = pow(10,9)
    P = list(map(int,input().split()))
    A = [-1]*N
    for i,p in enumerate(P):
        A[p] = i
    #print(A)
    left = A[0]
    right = A[0]
    ans = 1
    free = 0
    for i in range(1,N):
        #print(left,right,A[i])
        if A[i] < left:
            free += left - A[i] - 1
            left = A[i]
        elif right < A[i]:
            free += A[i] - right - 1
            right = A[i]
        else:
            ans *= free
            ans %= MOD
            free -= 1
        #print("free",free)
    print(ans)
        



if __name__ == '__main__':
    main()