/*
* @Author: hungeazy
* @Date: 2026-03-04 23:24:15
* @Last Modified by: hungeazy
* @Last Modified time: 2026-03-14 17:10:44
*/
#include <bits/stdc++.h>
using namespace std;
#define int long long
int a[11];
signed main()
{
ios_base::sync_with_stdio(false);
cin.tie(NULL); cout.tie(NULL);
int n = 10;
for (int i = 1; i <= n; i++) cin >> a[i];
int mx = -1001, mn = 1001, sum = 0;
for (int i = 1; i <= n; i++)
{
sum += a[i];
if (mx < a[i]) mx = a[i];
if (mn > a[i]) mn = a[i];
}
double A = sum*1.0/n;
int B = sum, C = mx-mn;
cout << fixed << setprecision(2) << abs(A*C-B);
return 0;
}
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