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