#include <bits/stdc++.h>
using namespace std;
const int LOG = 61;
const long long MOD = 998244353;
long long f(long long N){
  vector<vector<long long>> dp(LOG + 1, vector<long long>(2, 0));
  dp[LOG][0] = 1;
  for (int i = LOG - 1; i >= 0; i--){
    int d = N >> i & 1;
    if (d == 0){
      dp[i][0] += dp[i + 1][0];
      dp[i][1] += dp[i + 1][1] * 3;
    } else {
      dp[i][0] += dp[i + 1][0] * 2;
      dp[i][1] += dp[i + 1][0] + dp[i + 1][1] * 3;
    } 
    dp[i][0] %= MOD;
    dp[i][1] %= MOD;
  }
  return dp[0][1];
}
int main(){
  long long N, K;
  cin >> N >> K;
  cout << (f(N + K + 1) - f(K) + MOD) % MOD;
}