public static void main ( String [ ] args ) {
  Scanner sc = new Scanner ( System . in ) ;
  int W = sc . nextInt ( ) ;
  int n = sc . nextInt ( ) ;
  int K = sc . nextInt ( ) ;
  int [ ] a = new int [ n + 1 ] ;
  int [ ] b = new int [ n + 1 ] ;
  for ( int i = 1 ;
  i <= n ;
  i ++ ) {
    a [ i ] = sc . nextInt ( ) ;
    b [ i ] = sc . nextInt ( ) ;
  }
  int sumB = 0 ;
  for ( int w : b ) sumB += w ;
  int [ ] [ ] dp = new int [ K + 1 ] [ sumB + 1 ] ;
  for ( int i = 0 ;
  i < K + 1 ;
  i ++ ) Arrays . fill ( dp [ i ] , Integer . MAX_VALUE / 2 ) ;
  dp [ 0 ] [ 0 ] = 0 ;
  for ( int kind = 1 ;
  kind <= n ;
  kind ++ ) {
    for ( int k = K - 1 ;
    k >= 0 ;
    k -- ) {
      for ( int sum = sumB ;
      sum >= b [ kind ] ;
      sum -- ) {
        if ( dp [ k ] [ sum - b [ kind ] ] + a [ kind ] <= W ) dp [ k + 1 ] [ sum ] = Math . min ( dp [ k + 1 ] [ sum ] , dp [ k ] [ sum - b [ kind ] ] + a [ kind ] ) ;
      }
    }
  }
  int ans = - 1 ;
  for ( int k = 0 ;
  k <= K ;
  k ++ ) {
    for ( int sum = 0 ;
    sum <= sumB ;
    sum ++ ) {
      if ( dp [ k ] [ sum ] <= W ) ans = Math . max ( sum , ans ) ;
    }
  }
  System . out . println ( ans ) ;
}

public static void main ( String [ ] args ) { Scanner sc = new Scanner ( System . in ) ; int W = sc . nextInt ( ) ; int n = sc . nextInt ( ) ; int K = sc . nextInt ( ) ; int [ ] a = new int [ n + 1 ] ; int [ ] b = new int [ n + 1 ] ; for ( int i = 1 ; i <= n ; i ++ ) { a [ i ] = sc . nextInt ( ) ; b [ i ] = sc . nextInt ( ) ; } int sumB = 0 ; for ( int w : b ) sumB += w ; int [ ] [ ] dp = new int [ K + 1 ] [ sumB + 1 ] ; for ( int i = 0 ; i < K + 1 ; i ++ ) Arrays . fill ( dp [ i ] , Integer . MAX_VALUE / 2 ) ; dp [ 0 ] [ 0 ] = 0 ; for ( int kind = 1 ; kind <= n ; kind ++ ) { for ( int k = K - 1 ; k >= 0 ; k -- ) { for ( int sum = sumB ; sum >= b [ kind ] ; sum -- ) { if ( dp [ k ] [ sum - b [ kind ] ] + a [ kind ] <= W ) dp [ k + 1 ] [ sum ] = Math . min ( dp [ k + 1 ] [ sum ] , dp [ k ] [ sum - b [ kind ] ] + a [ kind ] ) ; } } } int ans = - 1 ; for ( int k = 0 ; k <= K ; k ++ ) { for ( int sum = 0 ; sum <= sumB ; sum ++ ) { if ( dp [ k ] [ sum ] <= W ) ans = Math . max ( sum , ans ) ; } } System . out . println ( ans ) ; }
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