const INF: usize = 1usize << 60;
const LIMIT: usize = 10000;

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