#include<bits/stdc++.h>
using namespace std;

using uint = unsigned int;
using ll = long long;

#define CIN( LL , A ) LL A; cin >> A 
#define GETLINE( A ) string A; getline( cin , A ) 
#define GETLINE_SEPARATE( A , SEPARATOR ) string A; getline( cin , A , SEPARATOR ) 
#define FOR_LL( VAR , INITIAL , FINAL_PLUS_ONE ) for( ll VAR = INITIAL ; VAR < FINAL_PLUS_ONE ; VAR ++ ) 
#define FOR_ITR( ARRAY , ITR , END ) for( auto ITR = ARRAY .begin() , END = ARRAY .end() ; ITR != END ; ITR ++ ) 
#define REPEAT( HOW_MANY_TIMES ) FOR_LL( VARIABLE_FOR_REPEAT , 0 , HOW_MANY_TIMES ) 
#define RETURN( ANSWER ) cout << ( ANSWER ) << endl; return 0 
#define DOUBLE( PRECISION , ANSWER ) cout << fixed << setprecision( PRECISION ) << ( ANSWER ) << endl; return 0 
#define MIN( A , B ) A < B ? A : B;
#define MAX( A , B ) A < B ? B : A;
template <typename T> inline T Distance( const T& a , const T& b ){ return a < b ? b - a : a - b; }

constexpr const ll D = 30;
constexpr const ll P = 998244353;

int main(){
  CIN( ll , N );
  CIN( ll , M );
  bool b[D] = {};
  ll M_copy = M;
  FOR_LL( d , 0 , D ){
    if( M_copy % 2 == 1 ){
      b[d] = true;
    }
    M_copy /= 2;
  }
  ll N_plus = N + 1;
  ll power_N_plus = 1;
  ll add[D] = {};
  FOR_LL( d , 0 , D ){
    if( b[d] ){
      add[d] = power_N_plus;
    }
    power_N_plus = ( power_N_plus * N_plus ) % P;
  }
  ll power_N = 1;
  FOR_LL( d , 0 , D ){
    ll d_neg = D - 1 - d;
    if( b[d_neg] ){
      add[d_neg] *= power_N;
      power_N = ( power_N * N ) % P;
    }
  }
  ll answer = 0;
  FOR_LL( d , 0 , 30 ){
    if( b[d] ){
      answer = ( answer + add[d] ) % P;
    }
  }
  answer = ( answer + power_N ) % P;
  RETURN( answer );
}