#include <iostream>
#include <algorithm>
#include <vector>

#define REP(i, a, b) for(int i = a; i < b; i++)

using namespace std;

int main () {
  int N, K;
  cin >> N >> K;

  vector <int> n(N);

  REP (i, 0, N) {
    cin >> n[i];
  }
  sort(n.begin(), n.end());

  cout << n[N-1] - n[0] << endl;

  return 0;
}