#include<iostream>
#include<vector>
#include<algorithm>
#include<cmath>
#include<string>

using namespace std;

int main(){
	int n,k;
	cin >> n >> k;
	vector<int> v(n);
	for(int i=0; i<n; i++) cin >> v[i];
	sort(v.begin(), v.end());
	cout << (v[v.size()-1] - v[0]) << endl;
}