#include <bits/stdc++.h>
using namespace std;
#define rep(i, n) for (int i = 0; i < (n); i++)
typedef long long ll;
typedef pair<int, int> pii;
typedef vector<ll> vll;
typedef vector<int> vi;
typedef vector<vector<int>> vvi;
typedef vector<vector<ll>> vvll;
const ll inf = 1e16;
const ll md = 1000000007;

int main() {
  int n,k;
  cin>>n>>k;
  int mx=0,mn=10000;
  rep(i,n){
    int a;
    cin>>a;
    mn=min(mn,a);
    mx=max(mx,a);
  }
  cout<<mx-mn<<endl;
  return 0;
}