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