#include <bits/stdc++.h>

#define F first
#define S second
#define MP make_pair
#define pb push_back
#define all(a) a.begin(), a.end()
#define rall(a) a.rbegin(), a.rend()
#define LCM(a, b) (a) / __gcd((a), (b)) * (b)
#define CEIL(a, b) (a)/(b)+(((a)%(b))?1:0)
#define log_2(a) (log((a)) / log(2))
#define ln '\n'

using namespace std;
using LL = long long;
using ldouble = long double;
using P = pair<int, int>;
using LP = pair<LL, LL>;

static const int INF = INT_MAX;
static const LL LINF = LLONG_MAX;
static const int MIN = INT_MIN;
static const LL LMIN = LLONG_MIN;
static const int MOD = 998244353;
static const int SIZE = 200005;

const int dx[] = {0, -1, 1, 0};
const int dy[] = {-1, 0, 0, 1};

vector<LL> Div(LL n) {
    vector<LL> ret;
    for(LL i = 1; i * i <= n; ++i) {
        if(n % i == 0) {
            ret.pb(i);
            if(i * i != n) ret.pb(n / i);
        }
    }
    sort(all(ret));
    return ret;
}

/*
 * 繰り返し自乗法
 */
//typedef long long LL;
LL power( LL x, LL n ) {
    LL res = 1;
    if( n > 0 ) {
        res = power( x, n / 2 );
        if( n % 2 == 0 ) res = ( res * res ) % MOD;
        else res = ( ( ( res * res ) % MOD ) * x ) % MOD;

    }
    return res;

}


int main() {
    ios::sync_with_stdio(false);
    cin.tie(0);

    LL N, L;
    cin >> N >> L;
    N -= L - 1;
    N = max(0ll, N);

    cout << power(2ll, N) - 1 << endl;
    return 0;
}