use std::io::{BufRead, Write};
use std::cmp;

fn main() {
    const INF: i32 = 1 << 30;
    const MAXY: usize = 10_000;

    let stdin = std::io::stdin();
    let stdout = std::io::stdout();
    let mut reader = std::io::BufReader::new(stdin.lock());
    let mut writer = std::io::BufWriter::new(stdout.lock());

    let n: usize = {
        let mut buf = String::new();
        reader.read_line(&mut buf).unwrap();
        buf.trim_end().parse().unwrap()
    };

    let y: Vec<i32> = {
        let mut buf = String::new();
        reader.read_line(&mut buf).unwrap();
        let iter = buf.split_whitespace();
        iter.map(|x| x.parse().unwrap()).collect()
    };

    let mut dp = vec![INF; MAXY as usize + 1];
    dp[0] = 0;
    for i in 0..n {
        let mut min = INF;
        for j in 0..(MAXY + 1) {
            min = cmp::min(min, dp[j]);
            dp[j] = min + (y[i] - j as i32).abs();
        }
    }

    let ans = dp.iter().min().unwrap();
    writeln!(writer, "{}", ans).unwrap();
}