#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);
  cout << a[n-1] - a[0] << endl;
  return 0;
}
