#include <bits/stdc++.h>
#include <cstdlib>
#include <math.h>
#include <atcoder/modint>
using namespace std;

using ll = long long;
using mint = atcoder::modint998244353;

vector<mint> d=
{
    1,
    295201906,
    160030060,
    957629942,
    545208507,
    213689172,
    760025067,
    939830261,
    506268060,
    39806322,
    808258749,
    440133909,
    686156489,
    741797144,
    390377694,
    12629586,
    544711799,
    104121967,
    495867250,
    421290700,
    117153405,
    57084755,
    202713771,
    675932866,
    79781699,
    956276337,
    652678397,
    35212756,
    655645460,
    468129309,
    761699708,
    533047427,
    287671032,
    206068022,
    50865043,
    144980423,
    111276893,
    259415897,
    444094191,
    593907889,
    573994984,
    892454686,
    566073550,
    128761001,
    888483202,
    251718753,
    548033568,
    428105027,
    742756734,
    546182474,
    62402409,
    102052166,
    826426395,
    159186619,
    926316039,
    176055335,
    51568171,
    414163604,
    604947226,
    681666415,
    511621808,
    924112080,
    265769800,
    955559118,
    763148293,
    472709375,
    19536133,
    860830935,
    290471030,
    851685235,
    242726978,
    169855231,
    612759169,
    599797734,
    961628039,
    953297493,
    62806842,
    37844313,
    909741023,
    689361523,
    887890124,
    380694152,
    669317759,
    367270918,
    806951470,
    843736533,
    377403437,
    945260111,
    786127243,
    80918046,
    875880304,
    364983542,
    623250998,
    598764068,
    804930040,
    24257676,
    214821357,
    791011898,
    954947696,
    183092975,
    613786113
};

mint fact(int n){
    int x=n/(int)1e7;
    mint ans=d[x];
    for(int i=x*1e7+1;i<=n;i++){
        if(i==998244353)continue;
        ans*=i;
    }
    return ans;
}

int main(){
    int n,k;
    cin >> n >> k;
    k=min(k,n-k);
    if(n>=998244353 && n-k<998244353){
        cout << 0 << endl;
    }else{
        cout << (fact(n)/fact(k)/fact(n-k)).val() << endl;
    }
    return 0;
}