#pragma GCC optimize("O3")
#pragma GCC target("avx")
#include <stdio.h>
//yukicoder does not support C99
int n,d,e,k,x[100000],r,s,t;
int main(){
	scanf("%d%d%d",&n,&d,&k);
	for(int i=0;i<n;i++)scanf("%d",x+i);
	for(int i=0;i<n;i++){
		int e=d+1;
		if(e>n-i)e=n-i;
		for(int j=0;j<e;j++)if(r<x[i+j]-x[i])r=x[i+j]-x[i],s=i,t=i+j;
	}
	printf(r?"%d\n%d %d\n":"0\n",r*k,s,t);
}