#include<bits/stdc++.h>
using namespace std;
using Int = long long;
//INSERT ABOVE HERE
signed main(){
  Int n,k;
  cin>>n>>k;
  vector<Int> a(n);
  for(Int i=0;i<n;i++) cin>>a[i];
  cout<<*max_element(a.begin(),a.end())
    -*min_element(a.begin(),a.end())<<endl;
  return 0;
}