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fn main() {
    let mut lines = std::io::stdin().lines();
    let (n, k) = {
        let nk = lines
            .next()
            .unwrap()
            .unwrap()
            .split_whitespace()
            .map(|x| str::parse(x).unwrap())
            .collect::<Vec<i32>>();
        (nk[0], nk[1])
    };
    let a = lines
        .next()
        .unwrap()
        .unwrap()
        .split_whitespace()
        .map(|x| str::parse(x).unwrap())
        .collect::<Vec<i32>>();
    let mut total = 0;
    for i in 0..n {
        let mut target = i32::MIN;
        for j in 0..n {
            target = target.max(a[j as usize] - (i - j).abs() * k);
        }
        total += target - a[i as usize];
    }
    println!("{}", total);
}