public static void main ( String [ ] args ) {
  Scanner sc = new Scanner ( System . in ) ;
  int N = Integer . parseInt ( sc . next ( ) ) ;
  long A = Long . parseLong ( sc . next ( ) ) ;
  long B = Long . parseLong ( sc . next ( ) ) ;
  long K = Long . parseLong ( sc . next ( ) ) ;
  final long p = 998244353 ;
  combination nC = new combination ( N , p ) ;
  long ans = 0 ;
  long b = 0 ;
  for ( int a = 0 ;
  a <= N ;
  a ++ ) {
    b = ( K - A * a ) / B ;
    if ( A * a > K ) {
      break ;
    }
    else if ( ( K - A * a ) % B != 0 || b > ( long ) N ) {
      continue ;
    }
    else {
      ans += ( nC . C ( a , p ) * nC . C ( ( int ) b , p ) ) % p ;
    }
  }
  System . out . println ( ans % p ) ;
}

public static void main ( String [ ] args ) { Scanner sc = new Scanner ( System . in ) ; int N = Integer . parseInt ( sc . next ( ) ) ; long A = Long . parseLong ( sc . next ( ) ) ; long B = Long . parseLong ( sc . next ( ) ) ; long K = Long . parseLong ( sc . next ( ) ) ; final long p = 998244353 ; combination nC = new combination ( N , p ) ; long ans = 0 ; long b = 0 ; for ( int a = 0 ; a <= N ; a ++ ) { b = ( K - A * a ) / B ; if ( A * a > K ) { break ; } else if ( ( K - A * a ) % B != 0 || b > ( long ) N ) { continue ; } else { ans += ( nC . C ( a , p ) * nC . C ( ( int ) b , p ) ) % p ; } } System . out . println ( ans % p ) ; }
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