use std::collections::BTreeSet;


fn main() {
    let mut n = String::new();
    std::io::stdin().read_line(&mut n).ok();
    let n: usize = n.trim().parse().unwrap();
    let mut temp = String::new();
    std::io::stdin().read_line(&mut temp).ok();
    let mut temp: Vec<usize> = temp.trim().split_whitespace().map(|s| s.parse().unwrap()).collect();
    if temp.len() > 1 {
        println!("\"assert\"");
    } else {
        for _ in 0..2 {
            let mut val = String::new();
            std::io::stdin().read_line(&mut val).ok();
            let val: usize = val.trim().parse().unwrap();
            temp.push(val);
        }
        let mut result = vec![temp[0]+temp[1], temp[1]+temp[2], temp[2]+temp[0]].iter().copied().collect::<BTreeSet<usize>>();
        println!("{}", result.iter().rev().nth(1).unwrap());
    }
}