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

int main() {
  int n,k;
  cin >> n >> k;
  vector<int> v;
  for (int i=0; i<n; i++) {
    int tmp;
    cin >> tmp;
    v.push_back(tmp);
  }
  sort(v.begin(), v.end());
  printf("%d\n", abs(v[0]-v[n-1]));

  return 0;
}