public static void main ( String [ ] args ) throws IOException {
  BufferedReader br = new BufferedReader ( new InputStreamReader ( System . in ) ) ;
  int w = Integer . parseInt ( br . readLine ( ) ) ;
  String [ ] tmp = br . readLine ( ) . split ( " " ) ;
  int n = Integer . parseInt ( tmp [ 0 ] ) ;
  int k = Integer . parseInt ( tmp [ 1 ] ) ;
  int [ ] a = new int [ n ] ;
  int [ ] b = new int [ n ] ;
  for ( int i = 0 ;
  i < n ;
  i ++ ) {
    tmp = br . readLine ( ) . split ( " " ) ;
    a [ i ] = Integer . parseInt ( tmp [ 0 ] ) ;
    b [ i ] = Integer . parseInt ( tmp [ 1 ] ) ;
  }
  int [ ] [ ] [ ] dp = new int [ n + 1 ] [ w + 1 ] [ k + 1 ] ;
  for ( int index = 0 ;
  index < n ;
  index ++ ) {
    for ( int width = 0 ;
    width <= w ;
    width ++ ) {
      for ( int num = 0 ;
      num < k ;
      num ++ ) {
        if ( a [ index ] > width ) dp [ index + 1 ] [ width ] [ num + 1 ] = dp [ index ] [ width ] [ num + 1 ] ;
        else dp [ index + 1 ] [ width ] [ num + 1 ] = Math . max ( dp [ index ] [ width ] [ num + 1 ] , dp [ index ] [ width - a [ index ] ] [ num ] + b [ index ] ) ;
      }
    }
  }
  System . out . println ( dp [ n ] [ w ] [ k ] ) ;
}

public static void main ( String [ ] args ) throws IOException { BufferedReader br = new BufferedReader ( new InputStreamReader ( System . in ) ) ; int w = Integer . parseInt ( br . readLine ( ) ) ; String [ ] tmp = br . readLine ( ) . split ( " ▁ " ) ; int n = Integer . parseInt ( tmp [ 0 ] ) ; int k = Integer . parseInt ( tmp [ 1 ] ) ; int [ ] a = new int [ n ] ; int [ ] b = new int [ n ] ; for ( int i = 0 ; i < n ; i ++ ) { tmp = br . readLine ( ) . split ( " ▁ " ) ; a [ i ] = Integer . parseInt ( tmp [ 0 ] ) ; b [ i ] = Integer . parseInt ( tmp [ 1 ] ) ; } int [ ] [ ] [ ] dp = new int [ n + 1 ] [ w + 1 ] [ k + 1 ] ; for ( int index = 0 ; index < n ; index ++ ) { for ( int width = 0 ; width <= w ; width ++ ) { for ( int num = 0 ; num < k ; num ++ ) { if ( a [ index ] > width ) dp [ index + 1 ] [ width ] [ num + 1 ] = dp [ index ] [ width ] [ num + 1 ] ; else dp [ index + 1 ] [ width ] [ num + 1 ] = Math . max ( dp [ index ] [ width ] [ num + 1 ] , dp [ index ] [ width - a [ index ] ] [ num ] + b [ index ] ) ; } } } System . out . println ( dp [ n ] [ w ] [ k ] ) ; }
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