package main

import . "fmt"
import . "sort"

func main() {
	var n,k int
	Scan(&n,&k)
	var x int64
	a :=make([]int,n)
	for i:=range a {
		Scan(&a[i])
		x+=int64(a[i])
	}
	for i:=range a {
		Scan(&a[i])
		x+=int64(a[i])
	}
	for i,v:=range a {
		Scan(&a[i])
		a[i]-=v
	}
	Ints(a)
	for _,v:=range a[k:] {
		x+=int64(v)
	}
	Println(x)
}