N, M = map(int, input().split())
mod = 998244353

q, r = divmod(M, N)
num = 1
for i in range(1, M+1):
    num = num*i%mod
a1 = 1
for i in range(1, q+1):
    a1 = a1*i%mod
a2 = a1*(q+1)%mod


ans = num*pow(pow(a1, N-r, mod)*pow(a2, r, mod), mod-2, mod)%mod
print(ans)