#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];
  int mi = INT_MAX, mx = -1;
  for (auto i : a) {
    mi = min(i, mi);
    mx = max(i, mx);
  }
  cout << mx - mi;
}
