package main

import . "fmt"
import . "os"
import bf "bufio"

// 解説を読んだので解説とおりにやってみる
// 修行不足

func main() {
	rd:=bf.NewReader(Stdin)
	var n,m,k int
	Fscan(rd,&n,&m,&k)
	c := make([]int, n)
	for i := range c {
		Fscan(rd,&c[i])
		c[i]--
	}
	var ans int = 1e18
	costs := make([]int, m)
	a := make([]int, m)
	for i := range a {
		Fscan(rd,&a[i])
		costs[i] = a[i]*k
		ans = min(ans, costs[i])
	}
	for _, v := range c[:k] {
		costs[v] -= a[v]
		ans = min(ans, costs[v])
	}
	for i, j := 0, k; j < n; i, j = i+1, j+1 {
		ci, cj := c[i], c[j]
		costs[ci] += a[ci]
		costs[cj] -= a[cj]
		ans = min(ans, costs[cj])
	}
	Println(ans)
}