N, M = gets.split.map(&:to_i)
MOD = 998244353

factorial = [1]
(1 .. M).each do |i|
    factorial << factorial[-1] * i % MOD
end

ans = factorial[M]
div = 1
larger = (M + N - 1) / N
smaller = M / N
larger_count = M % N
smaller_count = N - larger_count
div *= factorial[larger].pow(larger_count, MOD)
div *= factorial[smaller].pow(smaller_count, MOD)
ans *= div.pow(MOD - 2, MOD)
ans %= MOD

puts ans