#[allow(dead_code)]
mod io {
    use std::str::{FromStr, SplitWhitespace};

    pub struct Scanner<'a>(pub SplitWhitespace<'a>);

    impl<'a> Scanner<'a> {
        pub fn next<T: FromStr>(&mut self) -> T {
            self.0.next().unwrap().parse().ok().unwrap()
        }
    }

    pub fn next<'a, T: FromStr, I: Iterator<Item = &'a str>>(iter: &mut I) -> T {
        iter.next().unwrap().parse().ok().unwrap()
    }

    pub fn vec<T, F: FnMut() -> T>(f: F, n: usize) -> Vec<T> {
        std::iter::repeat_with(f).take(n).collect()
    }
}

use std::io::Read;

fn main() {
    let ref mut buf = String::new();
    std::io::stdin().read_to_string(buf).ok();
    let mut sc = io::Scanner(buf.split_whitespace());

    let n = sc.next::<usize>();
    let s = sc.next::<String>().into_bytes();
    let a = io::vec(|| sc.next::<i64>(), n);

    let mut ans = std::i64::MIN;

    let mut r_plus = 0;
    let mut b_plus = 0;
    for (s, a) in s.iter().zip(a.iter()) {
        if *s == b'R' {
            r_plus += a;
            b_plus -= a;
        } else {
            r_plus -= a;
            b_plus += a;
        }
        ans = ans.max(r_plus);
        ans = ans.max(b_plus);
        if r_plus < 0 {
            r_plus = 0;
        }
        if b_plus < 0 {
            b_plus = 0;
        }
    }

    println!("{}", ans);
}