fn main() {
    let mut xx = String::new();
    std::io::Read::read_to_string(&mut std::io::stdin(), &mut xx).ok();
    let mut xx: Vec<i64> = xx.split_whitespace().skip(1).flat_map(str::parse).collect();

    xx.sort_unstable();
    let answer = xx
        .iter()
        .enumerate()
        .map(|(i, &x)| (x - i as i64 - 1).abs())
        .sum::<i64>();

    println!("{answer}");
}