#include<bits/stdc++.h>

using namespace std;
using ll=long long;
#define rep2(i, a, n) for(int i = (a); i < (n); i++)
#define rep(i, n) rep2(i,0,n)

int main(){
  cin.tie(nullptr);ios_base::sync_with_stdio(false);
  int n,k,hoge,mina=INT_MAX,maxa=0;cin>>n>>k;
  rep(i,n){
    cin>>hoge;
    mina=min(hoge,mina);
    maxa=max(hoge,maxa);
  }
  cout<<maxa-mina<<endl;
}