#include <bits/stdc++.h>
using namespace std;
int main() {
  int n;
  cin >> n;
  int house[n];
  int min = 0;
  int max = 0;
  for (int i = 0; i < n; i++) {
    cin >> house[i];
    if (i == 0) {
      min = house[0];
      max = house[0];
    } else {
      if (min > house[0]) min = house[0];
      if (max < house[0]) max = house[0];
    }
  }
  cout << max - min << endl;
}
