#pragma GCC optimize("O3")
#include <iostream>
using namespace std;

constexpr int md = 998244353;

int main() {
    int N, K;
    cin >> N >> K;

    // Outer isomorphism of S6
    // https://en.wikipedia.org/wiki/Automorphisms_of_the_symmetric_and_alternating_groups
    int ret = K;
    for (int i = 1; i <= N - K; ++i) ret = (long long)ret * i % md;

    if (N == 2) {
        ret = 1;
    } else if (N == 6) {
        if (K == 2) ret = (long long)ret * 4 % md;
        if (K == 3) ret = (long long)ret * 3 % md;
        if (K == 4) ret = (long long)ret * 2 % md;
        if (K == 5) ret = (long long)ret * 2 % md;
        if (K == 6) ret = (long long)ret * 1 % md;
    }

    cout << ret  << '\n';
}