#![allow(unused_imports)] #![allow(non_snake_case)] use std::collections::HashMap; use std::collections::HashSet; #[allow(unused_macros)] macro_rules! read { ([$t:ty] ; $n:expr) => ((0..$n).map(|_| read!([$t])).collect::>()); ($($t:ty),+ ; $n:expr) => ((0..$n).map(|_| read!($($t),+)).collect::>()); ([$t:ty]) => (rl().split_whitespace().map(|w| w.parse().unwrap()).collect::>()); ($t:ty) => (rl().parse::<$t>().unwrap()); ($($t:ty),*) => {{ let buf = rl(); let mut w = buf.split_whitespace(); ($(w.next().unwrap().parse::<$t>().unwrap()),*) }}; } #[allow(dead_code)] fn rl() -> String { let mut buf = String::new(); std::io::stdin().read_line(&mut buf).unwrap(); buf.trim_end().to_owned() } fn main() { let dist = read!(i32, i32); let obst = read!(i32, i32); let min = (dist.0).abs().max((dist.1).abs()); if ((dist.0).abs() == dist.1) && (obst.0 == obst.1) { if (dist.0 * obst.0 > 0) && (dist.1 * obst.1 > 0) { if (dist.0 * dist.0 + dist.1 * dist.1) > (obst.0 * obst.0 + obst.1 * obst.1) { println!("{}", min + 1); return; } } } println!("{}", min); }