use std::cmp::{max, min};
use std::collections::BinaryHeap;
use std::iter::FromIterator;

fn f(a: &Vec<i64>, b: &Vec<i64>) -> Vec<i64> {
    let n = a.len();
    let mut s = Vec::with_capacity(n + 1);
    s.push(a.iter().sum());
    let mut h = BinaryHeap::from_iter(a.iter().map(|x| -x));
    for &x in b {
        let mut t = *s.last().unwrap();
        t += x;
        h.push(-x);
        t -= -h.pop().unwrap();
        s.push(t);
    }
    s
}

fn main() {
    let stdin = std::io::stdin();
    let mut locked = stdin.lock();
    let mut sc = scanner::Scanner::new(&mut locked);

    let n = sc.next_unsigned() as usize;
    let v: Vec<Vec<i64>> = (0..3)
        .map(|_| (0..n).map(|_| sc.next_signed()).collect())
        .collect();

    let s1 = f(&v[0], &v[1]);

    let x = v[2].iter().map(|x| -x).collect();
    let y = v[1].iter().rev().map(|x| -x).collect();

    let s2 = f(&x, &y);

    let r = s1.iter()
        .zip(s2.iter().rev())
        .map(|(&x, &y)| x + y)
        .max()
        .unwrap();

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

mod scanner {
    use std::io::{BufRead, Error, ErrorKind, Read};
    use std::str::FromStr;

    pub struct Scanner<'a, R>
    where
        R: 'a + BufRead + ?Sized,
    {
        reader: &'a mut R,
    }

    impl<'a, R> Scanner<'a, R>
    where
        R: 'a + BufRead + ?Sized,
    {
        pub fn new(reader: &'a mut R) -> Self {
            Scanner { reader: reader }
        }

        #[allow(dead_code)]
        pub fn next_byte(&mut self) -> u8 {
            self.reader
                .bytes()
                .skip_while(|ref c| !Self::is_printable(*c.as_ref().ok().unwrap()))
                .next()
                .unwrap()
                .unwrap()
        }

        #[allow(dead_code)]
        pub fn next_bytes(&mut self) -> Vec<u8> {
            self.reader
                .bytes()
                .skip_while(|ref c| !Self::is_printable(*c.as_ref().ok().unwrap()))
                .take_while(|ref c| Self::is_printable(*c.as_ref().ok().unwrap()))
                .collect::<Result<Vec<u8>, _>>()
                .unwrap()
        }

        #[allow(dead_code)]
        pub fn next_unsigned(&mut self) -> u64 {
            self.reader
                .bytes()
                .skip_while(|ref c| !Self::is_printable(*c.as_ref().ok().unwrap()))
                .take_while(|ref c| Self::is_printable(*c.as_ref().ok().unwrap()))
                .fold(Ok(0), |s, x| {
                    s.and_then(|t| {
                        x.and_then(|y| {
                            if b'0' <= y && y <= b'9' {
                                Ok(t * 10 + (y - b'0') as u64)
                            } else {
                                Err(Error::new(ErrorKind::InvalidData, "found not a digit"))
                            }
                        })
                    })
                })
                .unwrap()
        }

        #[allow(dead_code)]
        pub fn next_signed(&mut self) -> i64 {
            self.reader
                .bytes()
                .skip_while(|ref c| !Self::is_printable(*c.as_ref().ok().unwrap()))
                .take_while(|ref c| Self::is_printable(*c.as_ref().ok().unwrap()))
                .fold(Ok([0i64, 0]), |s, x| {
                    x.and_then(|y| {
                        s.and_then(|t| {
                            if t[0] == 0 && y == b'-' {
                                Ok([-1, 0])
                            } else if b'0' <= y && y <= b'9' {
                                Ok([
                                    if t[0] == 0 { 1 } else { t[0] },
                                    t[1] * 10 + (y - b'0') as i64,
                                ])
                            } else {
                                Err(Error::new(ErrorKind::InvalidData, "found not a digit"))
                            }
                        })
                    })
                })
                .and_then(|s| Ok(s[0] * s[1]))
                .unwrap()
        }

        #[allow(dead_code)]
        pub fn next_float(&mut self) -> f64 {
            self.reader
                .bytes()
                .skip_while(|ref c| !Self::is_printable(*c.as_ref().ok().unwrap()))
                .take_while(|ref c| Self::is_printable(*c.as_ref().ok().unwrap()))
                .collect::<Result<Vec<u8>, Error>>()
                .and_then(|t| {
                    String::from_utf8(t).or(Err(Error::new(ErrorKind::InvalidData, "invalid data")))
                })
                .and_then(|s| {
                    f64::from_str(&s).or(Err(Error::new(ErrorKind::InvalidData, "invalid data")))
                })
                .unwrap()
        }

        fn is_printable(c: u8) -> bool {
            0x21 <= c && c <= 0x7e
        }
    }
}


Measured memory_bytes: 14456