use std::cmp::{max, min};

fn main() {
    let mut n = String::new();
    std::io::stdin().read_line(&mut n).ok();
    let n: usize = n.trim().parse().unwrap();
    let mut st = String::new();
    std::io::stdin().read_line(&mut st).ok();
    let st: Vec<usize> = st.trim().split_whitespace().map(|s| s.parse().unwrap()).collect();
    let s = st[0] - 1;
    let t = st[1] - 1;
    let mut a = String::new();
    std::io::stdin().read_line(&mut a).ok();
    let a: Vec<usize> = a.trim().split_whitespace().map(|s| s.parse().unwrap()).collect();

    let summary: isize = a.iter().map(|&i| i as isize).sum();
    let diff = max(s, t) - min(s, t) - 1;
    let mut player_a = 0isize;
    if s > t {
        let idx = s - (diff+1) / 2;
        for i in 0..n/2+n%2 {
            player_a += a[(idx+i) % n] as isize;
        }
        if diff % 2 == 1 && n % 2 == 0 {
            let mut temp = player_a;
            temp -= a[idx] as isize;
            temp += a[(idx+n/2+n%2)%n] as isize;
            player_a = max(player_a, temp);
        }
    } else {
        let idx = s + (diff+1) / 2;
        for i in 0..n/2+n%2 {
            player_a += a[(idx+n-i) % n] as isize;
        }
        if diff % 2 == 1 && n % 2 == 0 {
            let mut temp = player_a;
            temp -= a[idx] as isize;
            temp += a[(idx+n/2+n%2)%n] as isize;
            player_a = max(player_a, temp);
        }
    }
    println!("{}", player_a * 2 - summary);
}