#include <bits/stdc++.h>
using namespace std;
void solve() {
  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());
}
int main() {
  ios::sync_with_stdio(0), cin.tie(0), cout.tie(0);
  ;
  int t = 1;
  while (t--) {
    solve();
    cout << "\n";
  }
  return 0;
}
