#include<iostream>
#include<algorithm>
#include<stdio.h>
#include<stdlib.h>
#include<vector>
#include<string>
#include<sstream>
using namespace std;


int main(){

  int n,k;
  cin >> n;
  cin >> k;
  vector<int> v;
  for(int i=0;i<n;i++){
    int tmp;
    cin >> tmp;
    v.push_back(tmp);
  }
  sort(v.begin(),v.end());

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

  return 0;
}