fn main() {
    let mut l = String::new();
    std::io::stdin().read_line(&mut l).ok();
    let mut l: Vec<i32> = l.trim().split_whitespace()
        .map(|e| e.parse().unwrap()).collect();
    let mut rby = String::new();
    std::io::stdin().read_line(&mut rby).ok();
    let mut rby: Vec<i32> = rby.trim().split_whitespace()
        .map(|e| e.parse().unwrap()).collect();

    let mut len = vec!((l[0] + l[1]) * 2, (l[0] + l[2]) * 2, (l[1] + l[2]) * 2);
    len.sort();
    rby.sort();
    rby.reverse();

    println!("{}", len[0] * rby[0] + len[1] * rby[1] + len[2] * rby[2]);
}