#include <bits/stdc++.h>
using namespace std;
int main() {
  int n;
  cin >> n;
  vector<int> a(n);
  for (int i = 0; i < n; i++) {
    cin >> a[i];
  }
  sort(a.begin(), a.end());
  int sum = a[1] - a[0];
  for (int i = 1; i < n - 1; i++) {
    sum += (a[i + 1] - a[i]);
  }
  cout << sum << endl;
}
