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

int main(){
  int n,k;
  cin >> n >> k;
  vector<int> v(n);
  for(int i=0;i<n;i++)cin >> v[i];
  cout << *max_element(v.begin(),v.end()) - *min_element(v.begin(),v.end()) << endl;
}