#![allow(non_snake_case, unused_imports, unused_must_use)]
use std::io::{self, prelude::*};
use std::str;

fn main() {
    let (stdin, stdout) = (io::stdin(), io::stdout());
    let mut scan = Scanner::new(stdin.lock());
    let mut out = io::BufWriter::new(stdout.lock());

    macro_rules! input {
        ($T: ty) => {
            scan.token::<$T>()
        };
        ($T: ty, $N: expr) => {
            (0..$N).map(|_| scan.token::<$T>()).collect::<Vec<_>>()
        };
    }

    let N = input!(usize);
    let M = input!(usize);
    let K = input!(usize);

    let C = input!(usize, N);
    let C = C.iter().map(|&c| c - 1).collect::<Vec<_>>();
    let A = input!(usize, M);

    let mut cnt = vec![0; M];

    for i in 0..K {
        cnt[C[i]] += 1;
    }

    let mut ans = 1 << 60;

    for i in 0..M {
        let s = (K - cnt[i]) * A[i];

        ans = std::cmp::min(ans, s);
    }

    for i in 0.. {
        if i + K >= N {
            break;
        }

        cnt[C[i]] -= 1;

        if i + K < N {
            cnt[C[i + K]] += 1;

            let s = (K - cnt[C[i + K]]) * A[C[i + K]];
            ans = std::cmp::min(ans, s);
        }
    }

    writeln!(out, "{}", ans);
}

struct Scanner<R> {
    reader: R,
    buf_str: Vec<u8>,
    buf_iter: str::SplitWhitespace<'static>,
}
impl<R: BufRead> Scanner<R> {
    fn new(reader: R) -> Self {
        Self {
            reader,
            buf_str: vec![],
            buf_iter: "".split_whitespace(),
        }
    }
    fn token<T: str::FromStr>(&mut self) -> T {
        loop {
            if let Some(token) = self.buf_iter.next() {
                return token.parse().ok().expect("Failed parse");
            }
            self.buf_str.clear();
            self.reader
                .read_until(b'\n', &mut self.buf_str)
                .expect("Failed read");
            self.buf_iter = unsafe {
                let slice = str::from_utf8_unchecked(&self.buf_str);
                std::mem::transmute(slice.split_whitespace())
            }
        }
    }
}