use std::io::Read;

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