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use std::io::{self, Read};

fn main() {
    let mut input = String::new();
    io::stdin().read_to_string(&mut input).unwrap();

    let mut it = input.split_whitespace();
	
	let n: usize = it.next().unwrap().parse().unwrap();
    let k: i32 = it.next().unwrap().parse().unwrap();

	let mut aa: Vec<i32> = Vec::new();
	let mut bb: Vec<i32> = Vec::new();

	for _ in 0..n {
        let ai: i32 = it.next().unwrap().parse().unwrap();
		aa.push(ai);
		bb.push(ai);
    }	
	
	for i in 0..n {
		for j in 0..n {
			bb[i] = bb[i].max(aa[j] - k * (i as i32 - j as i32).abs());
		}
	}
	
	print!("{}", bb.iter().zip(&aa).map(|(b, a)| (b - a) as i64).sum::<i64>());
}