#include <bits/stdc++.h>
using namespace std;
const int LOG = 61;
const long long MOD = 998244353;
int main(){
  long long N, K;
  cin >> N >> K;
  vector<long long> s;
  for (long long i = N; i > 0; i = (i - 1) & N){
    s.push_back(i);
  }
  s.push_back(0);
  long long ans = 0;
  for (long long x : s){
    ans += (long long) 1 << __builtin_popcount(K + x);
    ans %= MOD;
  }
  cout << ans << endl;
}