#include <bits/stdc++.h>
using namespace std;
int main() {
ios::sync_with_stdio(false);
cin.tie(nullptr);
int n;
cin >> n;
vector<long long> a(n);
long double sum = 0;
for (int i = 0; i < n; i++) {
cin >> a[i];
sum += a[i];
}
sort(a.begin(), a.end());
long double u = sum / n;
int l = 0, r = n - 1;
long double mn = u, mx = u;
while (l < r) {
int cnt = r - l + 1;
long double current = sum / cnt;
if (current >= u) {
sum -= a[r--];
} else {
sum -= a[l++];
}
cnt--;
long double next_avg = sum / cnt;
mn = min(mn, next_avg);
mx = max(mx, next_avg);
}
cout << fixed << setprecision(10) << (mx - mn) << "\n";
return 0;
}
