fn main() {
    input! {
        n: usize,
        k: usize,
        a: [i64; n],
        c: [usize1; n],
    }
    let mut sum = a.iter().cloned().cycle().take(2 * n).collect::<Vec<_>>();
    sum.push(0);
    for i in (0..(2 * n)).rev() {
        sum[i] += sum[i + 1];
    }
    let mut dp = vec![vec![0usize; 2 * n + 1]; 2 * n + 1];
    let mut ep = vec![vec![0usize; 2 * n + 1]; 2 * n + 1];
    for (i, c) in c.iter().enumerate() {
        dp[i][i + 1] = 1 << *c;
        dp[n + i][n + i + 1] = 1 << *c;
        ep[i + 1][i] = 1 << *c;
        ep[n + i + 1][n + i] = 1 << *c;
    }
    let mut ans = *a.iter().max().unwrap();
    for len in 2..=n {
        for l in 0..n {
            let r = l + len;
            let mut v = 0;
            for (&x, &y) in dp[l][(l + 1)..r].iter().zip(ep[r][(l + 1)..].iter()) {
                for j in 0..=k {
                    v |= x & (y >> j);
                    v |= x & (y << j);
                    v |= y & (x >> j);
                    v |= y & (x << j);
                }
            }
            dp[l][r] = v;
            ep[r][l] = v;
            if r + n <= 2 * n {
                dp[l + n][r + n] = v;
                ep[r + n][l + n] = v;
            }
            if v != 0 {
                ans = ans.max(sum[l] - sum[r]);
            }
        }
    }
    println!("{}", ans);
}

// ---------- begin input macro ----------
// reference: https://qiita.com/tanakh/items/0ba42c7ca36cd29d0ac8
#[macro_export]
macro_rules! input {
    (source = $s:expr, $($r:tt)*) => {
        let mut iter = $s.split_whitespace();
        input_inner!{iter, $($r)*}
    };
    ($($r:tt)*) => {
        let s = {
            use std::io::Read;
            let mut s = String::new();
            std::io::stdin().read_to_string(&mut s).unwrap();
            s
        };
        let mut iter = s.split_whitespace();
        input_inner!{iter, $($r)*}
    };
}

#[macro_export]
macro_rules! input_inner {
    ($iter:expr) => {};
    ($iter:expr, ) => {};
    ($iter:expr, $var:ident : $t:tt $($r:tt)*) => {
        let $var = read_value!($iter, $t);
        input_inner!{$iter $($r)*}
    };
}

#[macro_export]
macro_rules! read_value {
    ($iter:expr, ( $($t:tt),* )) => {
        ( $(read_value!($iter, $t)),* )
    };
    ($iter:expr, [ $t:tt ; $len:expr ]) => {
        (0..$len).map(|_| read_value!($iter, $t)).collect::<Vec<_>>()
    };
    ($iter:expr, chars) => {
        read_value!($iter, String).chars().collect::<Vec<char>>()
    };
    ($iter:expr, bytes) => {
        read_value!($iter, String).bytes().collect::<Vec<u8>>()
    };
    ($iter:expr, usize1) => {
        read_value!($iter, usize) - 1
    };
    ($iter:expr, $t:ty) => {
        $iter.next().unwrap().parse::<$t>().expect("Parse error")
    };
}
// ---------- end input macro ----------