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