USACO Ski Course Design

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/*
 ID: wcr19961
 PROG: skidesign
 LANG: C++11
 */
#include <cstdio>
#include <cstring>
#include <algorithm>
#include <cstdlib>
#include <string>
#include <set>
using namespace std;
typedef long long LL;
const int inf = 0x3f3f3f3f;
const int maxn = 110;
int a[maxn];
int main() {
  freopen("skidesign.in", "r", stdin);
  freopen("skidesign.out", "w", stdout);
  int n, ans = inf, l = 100, r = 0;
  scanf("%d", &n);
  for (int i = 0; i < n; ++i) {
    int x;
    scanf("%d", &x);
    l = min(l, x), r = max(r, x);
    ++a[x];
  }
  for (int i = l; i <= r; ++i) {
    int res = 0;
    for (int j = l; j <= r; ++j) {
      if (a[j] > 0) {
        if (j < i) {
          res += a[j] * (j - i) * (j - i);
        }
        if (j > i + 17) {
          res += a[j] * (j - i - 17) * (j - i - 17);
        }
      }
    }
    ans = min(ans, res);
  }
  printf("%d\n", ans);
  return 0;
}