use std::io::Read;

fn main() {
	let mut s = String::new();
	std::io::stdin().read_to_string(&mut s).ok();
	let v: Vec<i32> = s.split_whitespace().flat_map(str::parse).collect();
	let n = v[0] as f64;
	let (x, y) = v[1..].chunks(2).fold((0., 0.), |(x, y), e| {
		(x + e[0] as f64 / n, y + e[1] as f64 / n)
	});
	let a = v[1..].chunks(2).fold(0, |t, e| {
		t + (e[0] - x.round() as i32).abs() + (e[1] - y.round() as i32).abs()
	});
	println!("{a}")
}