const INF: usize = 1usize << 60;
const LIMIT: usize = 1e4 as usize;

fn main() {
    let mut n = String::new();
    std::io::stdin().read_line(&mut n).ok();
    let n: usize = n.trim().parse().unwrap();
    let mut y = String::new();
    std::io::stdin().read_line(&mut y).ok();
    let y: Vec<usize> = y.trim().split_whitespace().map(|s| s.parse().unwrap()).collect();

    let mut dp = vec![vec![INF; LIMIT+1]; n];
    for i in 0..=LIMIT {
        dp[0][i] = y[0].max(i) - y[0].min(i);
    }
    for i in 1..n {
        let mut pmin = INF;
        for j in 0..=LIMIT {
            pmin = pmin.min(dp[i-1][j]);
            let diff = y[i].max(j) - y[i].min(j);
            dp[i][j] = dp[i][j].min(pmin + diff);
        }
    }
    println!("{}", dp[n-1].iter().min().unwrap());
}