import sys
input = sys.stdin.readline

class ModInt:
	mod = 998244353

	def __init__(self, x):
		self.x = x % ModInt.mod

	@classmethod
	def set_mod(cls, mod: int) -> None:
		ModInt.mod = mod
		
	def __str__(self):
		return str(self.x)

	__repr__ = __str__

	def __add__(self, other):
		return (ModInt(self.x + other.x) if isinstance(other, ModInt) else ModInt(self.x + other))

	def __sub__(self, other):
		return (ModInt(self.x - other.x) if isinstance(other, ModInt) else ModInt(self.x - other))

	def __mul__(self, other):
		return (ModInt(self.x * other.x) if isinstance(other, ModInt) else ModInt(self.x * other))

	def __truediv__(self, other):
		return (ModInt(self.x * pow(other.x, ModInt.mod - 2, ModInt.mod)) if isinstance(other, ModInt)
		  else ModInt(self.x * pow(other, ModInt.mod - 2, ModInt.mod)))

	def __pow__(self, other):
		return ModInt(pow(self.x, other.x, ModInt.mod)) if isinstance(other, ModInt) else ModInt(pow(self.x, other, ModInt.mod))

	__radd__ = __add__

	def __rsub__(self, other):
		return (ModInt(other.x - self.x) if isinstance(other, ModInt) else ModInt(other - self.x))

	__rmul__ = __mul__

	def __rtruediv__(self, other):
		return (ModInt(other.x * pow(self.x, ModInt.mod - 2, ModInt.mod)) if isinstance(other, ModInt)
		  else ModInt(other * pow(self.x, ModInt.mod - 2, ModInt.mod)))

	def __rpow__(self, other):
		return ModInt(pow(other.x, self.x, ModInt.mod)) if isinstance(other, ModInt) else ModInt(pow(other, self.x, ModInt.mod))

	def __iadd__(self, other):
		self = self + other
		return self

	def __isub__(self, other):
		self = self - other
		return self

	def __imul__(self, other):
		self = self * other
		return self

	def __itruediv__(self, other):
		self = self / other
		return self
	
	@classmethod
	def nCk(cls, n, k):
		if(isinstance(n, ModInt)):
			n = n.x
		if(isinstance(k, ModInt)):
			k = k.x
		r = min(n - k, k)
		ret = ModInt(1)
		for i in range(n - r + 1, n + 1):
			ret *= i
		d = ModInt(1)
		for i in range(2, r + 1):
			d *= i
		ret /= d
		return ret

"""
Main Code
"""

n, m = map(int, input().split())

a = [0] * n
t = m
i = 0
while(t > 0):
	a[i % n] += 1
	t -= 1
	i += 1
# print(a)

ans = ModInt(1)
for i in range(2, m + 1):
	ans *= i
for k in a:
	ans /= k
print(ans)