#include<iostream>
#include<algorithm>
using namespace std;

int n, d, k, x[100000] = {}, ans = 0, a = 0, b = 0;

int main(){
	cin >> n >> d >> k;
	for (int i = 0; i < n; i++){
		cin >> x[i];
	}

	for (int i = 0; i < n - 1; i++){
		for (int j = i + 1; j <= min(i + d, n - 1); j++){
			if (x[j] - x[i] > ans){
				ans = x[j] - x[i];
				a = i;
				b = j;
			}
		}
	}

	cout << ans * k << "\n";

	if (ans > 0){
		cout << a << ' ' << b;
	}

	return 0;
}