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