#include <bits/stdc++.h>
using namespace std;

int main () {
  int N;
  int a[1000];
  cin >> N;
  for (int i = 0; i < N; i++) {
    cin >> a[i];
  }
  sort (a, a + N);
  cout << a[N - 1] - a[0] << endl;
}