n,m = map(int,input().split())
mod = 998244353

facts = [1]*(m+2)
for i in range(2,m+1):
    facts[i] = facts[i-1]*i%mod
    
ans = facts[m]
# print(ans)
d,mo = divmod(m,n)
base = 1
for i in range(n):
    if i < mo:
        base *= facts[d+1]
    else:
        base *= facts[d]
    base %= mod
ans *= pow(base,mod-2,mod)
print(ans%mod)