#include <bits/stdc++.h>
using namespace std;

int main() {
  int N, K;
  cin >> N >> K;
  vector<int> V(N);
  for (int i = 0; i < N; i++) cin >> V.at(i);
  cout << *max_element(V.begin(), V.end()) - *min_element(V.begin(), V.end()) << "\n";
}