import sys
input = sys.stdin.readline
from collections import *

MAX = 10**6+10
MOD = 998244353
fact = [0]*MAX #fact[i]: i!
inv = [0]*MAX #inv[i]: iの逆元
finv = [0]*MAX #finv[i]: i!の逆元
fact[0] = 1
fact[1] = 1
finv[0] = 1
finv[1] = 1
inv[1] = 1
    
for i in range(2, MAX):
    fact[i] = fact[i-1]*i%MOD
    inv[i] = MOD-inv[MOD%i]*(MOD//i)%MOD
    finv[i] = finv[i-1]*inv[i]%MOD

N, M = map(int, input().split())
A = [M//N for _ in range(N)]

for i in range(M%N):
    A[i] += 1
    
ans = fact[M]

for Ai in A:
    ans *= finv[Ai]
    ans %= MOD

print(ans)