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#include <cstdio>
#include <math.h>

int main(void)
{
	static int h[1000];
	int n, k, i, j, r = 0;
	scanf("%u%u", &n, &k);
	for (i = 0; i < n; i++)
		scanf("%u", &h[i]);
	for (i = 0; i < n; i++) {
		int h_i = h[i];
		for (j = 0; j < n; j++) {
			int h_min = h_i - abs(i - j) * k;
			if (h[j] < h_min) {
				r += h_min - h[j];
				h[j] = h_min;
			}
		}
	}
	printf("%u\n", r);
	return 0;
}