use proconio::input;

fn main() {
    input! {
        n:usize,
        y:[usize;n],
    }

    let y_max = *y.iter().max().unwrap();
    let mut dp = vec![vec![0; y_max + 1]; n];
    let mut min_cum = vec![0; y_max + 1];
    for i in 0..n {
        for j in 0..=y_max {
            dp[i][j] = j.abs_diff(y[i]) + min_cum[j];
            if j != 0 {
                min_cum[j] = min_cum[j - 1].min(dp[i][j]);
            } else {
                min_cum[j] = dp[i][j];
            }
        }
    }

    let ans = *dp[n - 1].iter().min().unwrap();
    println!("{}", ans);
}