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#include <bits/stdc++.h>

#include <iostream>

using namespace std;

int main(){

//program to find min difference when k is added or subtracted from every element.

int n;

cin>>n;

int arr[n];

for(int i=0;i<n;i++){

cin>>arr[i];

}

int k;

cin>>k;

sort(arr, arr+n);

int ans = arr[n-1] - arr[0];

int mx = arr[n-1] - k;

int mn = arr[0] + k;

if(mn>mx) swap(mx, mn);

for(int i=1;i<n-1;i++){

int ad = arr[i] + k;

int su = arr[i] - k;

if(ad<mx || su>mn) continue;

if(ad-mn<mx-su){

mx = ad;

}else{

mn = su;

}

}

cout<<min(ans, mx - mn)<<endl;

return 0;

}