#include <stdio.h>

typedef struct {
	int key, id;
} data;

typedef struct {
	data obj[200001];
	int size;
} max_heap;

void push(max_heap* h, data x)
{
	int i = ++(h->size), j = i >> 1;
	data tmp;
	h->obj[i] = x;
	while (j > 0) {
		if (h->obj[i].key > h->obj[j].key) {
			tmp = h->obj[j];
			h->obj[j] = h->obj[i];
			h->obj[i] = tmp;
			i = j;
			j >>= 1;
		} else break;
	}
}

data pop(max_heap* h)
{
	int i = 1, j = 2;
	data output = h->obj[1], tmp;
	h->obj[1] = h->obj[(h->size)--];
	while (j <= h->size) {
		if (j < h->size && h->obj[j^1].key > h->obj[j].key) j ^= 1;
		if (h->obj[j].key > h->obj[i].key) {
			tmp = h->obj[j];
			h->obj[j] = h->obj[i];
			h->obj[i] = tmp;
			i = j;
			j <<= 1;
		} else break;
	}
	return output;
}

void chmax(long long* a, long long b)
{
	if (*a < b) *a = b;
}

int main()
{
	int i, N;
	data d;
	max_heap h;
	h.size = 0;
	scanf("%d", &N);
	for (i = 1; i <= N; i++) {
		scanf("%d", &(d.key));
		d.id = i;
		push(&h, d);
	}
	
	long long ans = 0, tmp = (long long)N * (N + 1) / 2;
	while (h.size > 0) {
		d = pop(&h);
		chmax(&ans, tmp - d.id * 2);
		tmp -= d.id;
	}
	printf("%lld\n", ans);
	fflush(stdout);
	return 0;
}