#include <stdio.h>
#include <bits/stdc++.h>
#include <atcoder/all>
using namespace atcoder;
using mint = modint998244353;
using namespace std;
#define rep(i,n) for (int i = 0; i < (n); ++i)
#define Inf 1000000001

int main(){
	
	int n,k;
	cin>>n>>k;
	
	vector<int> a(n);
	rep(i,n)cin>>a[i];
	sort(a.begin(),a.end());
	
	cout<<a.back() -  a[0]<<endl;
	
	return 0;
}