#include <iostream>
#include <list>
#include <vector>
#include <string>
#include <stdio.h>
#include <stdint.h>
using namespace std;

using uint = unsigned int;
using ll = long long;

int main()
{

  ll N;
  ll K;
  cin >> N;
  cin >> K;

  ll n;
  ll n_min = 1001;
  ll n_max = 0;
  
  for( ll i = 0 ; i < N ; i++ ){

    cin >> n;

    if( n < n_min ){

      n_min = n;

    }

    if( n_max < n ){

      n_max = n;

    }

  }
  
  cout << n_max - n_min << endl;;
  return 0;

}