public static void main ( String [ ] args ) {
  Scanner s = new Scanner ( System . in ) ;
  int n = s . nextInt ( ) ;
  int m = s . nextInt ( ) ;
  int [ ] arr = new int [ n ] ;
  int [ ] brr = new int [ m ] ;
  for ( int i = 0 ;
  i < n ;
  i ++ ) {
    arr [ i ] = s . nextInt ( ) ;
  }
  for ( int i = 0 ;
  i < m ;
  i ++ ) {
    brr [ i ] = s . nextInt ( ) ;
  }
  int count = 0 ;
  int ptr = 0 ;
  for ( int i = 0 ;
  i < n ;
  i ++ ) {
    if ( arr [ i ] <= brr [ ptr ] ) {
      count ++ ;
      ptr ++ ;
    }
    if ( ptr == m ) break ;
  }
  System . out . println ( count ) ;
}

public static void main ( String [ ] args ) { Scanner s = new Scanner ( System . in ) ; int n = s . nextInt ( ) ; int m = s . nextInt ( ) ; int [ ] arr = new int [ n ] ; int [ ] brr = new int [ m ] ; for ( int i = 0 ; i < n ; i ++ ) { arr [ i ] = s . nextInt ( ) ; } for ( int i = 0 ; i < m ; i ++ ) { brr [ i ] = s . nextInt ( ) ; } int count = 0 ; int ptr = 0 ; for ( int i = 0 ; i < n ; i ++ ) { if ( arr [ i ] <= brr [ ptr ] ) { count ++ ; ptr ++ ; } if ( ptr == m ) break ; } System . out . println ( count ) ; }
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