#include <iostream>
#include <string>
#include <vector>
#include <algorithm>
#include <array>
#include <atcoder/modint>
using namespace std;
using i32 = int32_t;
using u32 = uint32_t;
using i64 = int64_t;
using u64 = uint64_t;
#define rep(i,n) for(int i=0; i<(int)(n); i++)

const i64 INF = 1001001001001001001;

using modint = atcoder::static_modint<998244353>;

int main(){
    u64 N,M; cin >> N >> M;
    if(M <= 30){
        u64 ans = 0;
        rep(i,M) ans ^= (N << i);
        ans %= 998244353;
        cout << ans << endl;
        return 0;
    }

    u64 c = 0;
    rep(i,30) c ^= (N << i);
    modint ans = c & ((1 << 30) - 1);
    ans += (modint(2).pow(M) - modint(2).pow(30)) * __builtin_parity(N);
    ans += modint(c >> 30) * modint(2).pow(M);
    cout << ans.val() << endl;
    return 0;
}


struct ios_do_not_sync{
    ios_do_not_sync(){
        std::ios::sync_with_stdio(false);
        std::cin.tie(nullptr);
    }
} ios_do_not_sync_instance;