#include <iostream>
#include <algorithm>
#include <vector>
using namespace std;

int main() {
  int n, k;
  cin >> n >> k;
  vector<int> v(n);
  for (auto& a : v) {
    cin >> a;
  }
  sort(v.begin(), v.end());
  cout << v[n - 1] - v[0] << endl;
}