#![allow(non_snake_case)]

use std::cmp;
use std::io::{ self, prelude::* };

macro_rules! pick {
    ($tokens:expr) => {
        $tokens.next().unwrap().parse().expect("parse error")
    }
}

const INF: i64 = 1_010_000_000_000_000_000;

fn main() {
    let mut s = String::new();
    io::stdin().read_to_string(&mut s).expect("i/o error");
    let mut tokens = s.split_whitespace();

    let N: usize = pick!(tokens);
    let mut A: Vec<i64> = Vec::with_capacity(N);
    for _ in 0..N {
        A.push(pick!(tokens));
    }

    let mean = A.iter().sum::<i64>() / N as i64;
    let mut ans = INF;
    for m in mean-100..mean+101 {
        let cur = A.iter()
            .map(|a| (a-m).abs())
            .sum::<i64>();
        ans = cmp::min(ans, cur);
    }

    println!("{}", ans);
}