public static void main ( String [ ] args ) {
  Scanner sc = new Scanner ( System . in ) ;
  int max = 400000 ;
  int mod = 998244353 ;
  long [ ] pw = new long [ max ] ;
  pw [ 0 ] = 1 ;
  long [ ] ipw = new long [ max ] ;
  BigInteger modb = new BigInteger ( String . valueOf ( mod ) ) ;
  for ( int i = 1 ;
  i < max ;
  i ++ ) {
    pw [ i ] = ( i * pw [ i - 1 ] ) % mod ;
  }
  for ( int i = 0 ;
  i < max ;
  i ++ ) {
    ipw [ i ] = new BigInteger ( String . valueOf ( pw [ i ] ) ) . modInverse ( modb ) . longValue ( ) ;
  }
  long n = sc . nextLong ( ) ;
  long a = sc . nextLong ( ) ;
  long b = sc . nextLong ( ) ;
  long k = sc . nextLong ( ) ;
  long ans = 0 ;
  for ( int A = 0 ;
  A <= n ;
  A ++ ) {
    if ( ( k - A * a ) % b != 0 ) continue ;
    long B = ( k - A * a ) / b ;
    if ( B > n || B < 0 ) continue ;
    ans += ( comb ( n , A , mod , pw , ipw ) * comb ( n , B , mod , pw , ipw ) ) % mod ;
    ans %= mod ;
  }
  System . out . println ( ans ) ;
}

public static void main ( String [ ] args ) { Scanner sc = new Scanner ( System . in ) ; int max = 400000 ; int mod = 998244353 ; long [ ] pw = new long [ max ] ; pw [ 0 ] = 1 ; long [ ] ipw = new long [ max ] ; BigInteger modb = new BigInteger ( String . valueOf ( mod ) ) ; for ( int i = 1 ; i < max ; i ++ ) { pw [ i ] = ( i * pw [ i - 1 ] ) % mod ; } for ( int i = 0 ; i < max ; i ++ ) { ipw [ i ] = new BigInteger ( String . valueOf ( pw [ i ] ) ) . modInverse ( modb ) . longValue ( ) ; } long n = sc . nextLong ( ) ; long a = sc . nextLong ( ) ; long b = sc . nextLong ( ) ; long k = sc . nextLong ( ) ; long ans = 0 ; for ( int A = 0 ; A <= n ; A ++ ) { if ( ( k - A * a ) % b != 0 ) continue ; long B = ( k - A * a ) / b ; if ( B > n || B < 0 ) continue ; ans += ( comb ( n , A , mod , pw , ipw ) * comb ( n , B , mod , pw , ipw ) ) % mod ; ans %= mod ; } System . out . println ( ans ) ; }
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