#include <bits/stdc++.h>
using namespace std;
const int mxN = (int)1e3+10;
int n;
double a[mxN];
int main()
{
cin >> n;
for(int i = 0; i < n; i++) cin >> a[i];
sort(a,a+n); double ans = a[n-1]-a[0];
for(int mask = 0; mask < (1<<n); mask++){
double cur = accumulate(a,a+n,0.0)/n;
double l = cur, r = cur;
int L = 0, R = n-1;
for(int i = 0; i < n-1; i++){
if((mask>>i)&1) L++;
else R--;
cur = accumulate(a+L,a+R+1,0.0)/(R-L+1);
l = min(l, cur), r = max(r, cur);
}
ans = min(ans, r-l);
}
cout << fixed << setprecision(9) << ans;
}
