fn main() {
    let n = read::<usize>();
    let y = read_vec::<usize>();
    let y_max = y.iter().max().unwrap();
    let mut dp = vec![0; y_max + 1];
    for i in 0..n {
        let mut accum_min = vec![0; y_max + 1];
        accum_min[0] = dp[0];
        for i in 1..y_max + 1 {
            accum_min[i] = std::cmp::min(accum_min[i - 1], dp[i]);
        }

        let mut next = vec![0; y_max + 1];
        for yi in 0..y_max + 1 {
            let cost = (y[i] as i64 - yi as i64).abs() as usize;
            next[yi] = accum_min[yi] + cost;
        }
        dp = next;
    }
    let ans = dp.iter().min().unwrap();
    println!("{}", ans);
}

fn read<T: std::str::FromStr>() -> T {
    let mut s = String::new();
    std::io::stdin().read_line(&mut s).ok();
    s.trim().parse().ok().unwrap()
}

fn read_vec<T: std::str::FromStr>() -> Vec<T> {
    read::<String>()
        .split_whitespace()
        .map(|e| e.parse().ok().unwrap())
        .collect()
}