public static void main ( String [ ] args ) throws IOException {
  BufferedReader in = new BufferedReader ( new InputStreamReader ( System . in ) ) ;
  PrintWriter pw = new PrintWriter ( System . out ) ;
  StringTokenizer st ;
  st = new StringTokenizer ( in . readLine ( ) ) ;
  int res = 0 ;
  double r = parseDouble ( st . nextToken ( ) ) , d = parseDouble ( st . nextToken ( ) ) ;
  int n = parseInt ( in . readLine ( ) ) ;
  for ( int i = 0 ;
  i < n ;
  i ++ ) {
    st = new StringTokenizer ( in . readLine ( ) ) ;
    double xi = parseDouble ( st . nextToken ( ) ) , yi = parseDouble ( st . nextToken ( ) ) , ri = parseDouble ( st . nextToken ( ) ) ;
    if ( solve ( r , d , xi , yi , ri ) ) res ++ ;
  }
  pw . println ( res ) ;
  pw . close ( ) ;
}

public static void main ( String [ ] args ) throws IOException { BufferedReader in = new BufferedReader ( new InputStreamReader ( System . in ) ) ; PrintWriter pw = new PrintWriter ( System . out ) ; StringTokenizer st ; st = new StringTokenizer ( in . readLine ( ) ) ; int res = 0 ; double r = parseDouble ( st . nextToken ( ) ) , d = parseDouble ( st . nextToken ( ) ) ; int n = parseInt ( in . readLine ( ) ) ; for ( int i = 0 ; i < n ; i ++ ) { st = new StringTokenizer ( in . readLine ( ) ) ; double xi = parseDouble ( st . nextToken ( ) ) , yi = parseDouble ( st . nextToken ( ) ) , ri = parseDouble ( st . nextToken ( ) ) ; if ( solve ( r , d , xi , yi , ri ) ) res ++ ; } pw . println ( res ) ; pw . close ( ) ; }
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