#include <bits/stdc++.h>
using namespace std;
int main() {
  int a[1000], n, max = -10000000, min = 10000000;
  cin >> n;
  for (int i = 1; i <= n; i++) {
    cin >> a[i];
    if (a[i] > max) max = a[i];
    if (a[i] < min) min = a[i];
  }
  cout << max - min;
  return 0;
}
