public static void main ( String args [ ] ) {
  Scanner sc = new Scanner ( System . in ) ;
  int q = sc . nextInt ( ) ;
  while ( q -- > 0 ) {
    int n = sc . nextInt ( ) ;
    int k = sc . nextInt ( ) ;
    int z = sc . nextInt ( ) ;
    int ar [ ] = new int [ n ] ;
    int i = 0 ;
    for ( i = 0 ;
    i < n ;
    i ++ ) {
      ar [ i ] = sc . nextInt ( ) ;
    }
    long ans = 0 ;
    for ( int t = 0 ;
    t <= z ;
    t ++ ) {
      int pos = k - 2 * t ;
      if ( pos < 0 ) continue ;
      long s = 0 ;
      long max = 0 ;
      for ( i = 0 ;
      i <= pos ;
      i ++ ) {
        if ( i != n - 1 ) {
          max = Math . max ( max , ( long ) ( ar [ i ] + ar [ i + 1 ] ) ) ;
        }
        s += ar [ i ] ;
      }
      s += ( t ) * max ;
      ans = Math . max ( ans , s ) ;
    }
    System . out . println ( ans ) ;
  }
}

public static void main ( String args [ ] ) { Scanner sc = new Scanner ( System . in ) ; int q = sc . nextInt ( ) ; while ( q -- > 0 ) { int n = sc . nextInt ( ) ; int k = sc . nextInt ( ) ; int z = sc . nextInt ( ) ; int ar [ ] = new int [ n ] ; int i = 0 ; for ( i = 0 ; i < n ; i ++ ) { ar [ i ] = sc . nextInt ( ) ; } long ans = 0 ; for ( int t = 0 ; t <= z ; t ++ ) { int pos = k - 2 * t ; if ( pos < 0 ) continue ; long s = 0 ; long max = 0 ; for ( i = 0 ; i <= pos ; i ++ ) { if ( i != n - 1 ) { max = Math . max ( max , ( long ) ( ar [ i ] + ar [ i + 1 ] ) ) ; } s += ar [ i ] ; } s += ( t ) * max ; ans = Math . max ( ans , s ) ; } System . out . println ( ans ) ; } }
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