#include <bits/stdc++.h>
using namespace std;
//#include <atcoder/all>
//using namespace atcoder;
using ll=long long;
using Graph=vector<vector<int>>;
#define MAX 1000000
#define MOD 1000000007
//#define MOD 998244353
#define INF 1000000000
//#define INF 1000000000000000000

int main(){
  int N,K;
  cin>>N>>K;
  vector<int> a(N);
  for(int i=0;i<N;i++){
    cin>>a[i];
  }
  sort(a.begin(),a.end());
  cout<<a[N-1]-a[0]<<endl;
}