#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, greater<int>());
  int answer = a[N - 1] - a[0];
  cout << answer << endl;
}
