#include<iostream>
#include<string>
#include<vector>
#include<set>
#include<algorithm>
#include<queue>
#include<functional>
#define ll long long
#define PLL pair<ll,ll>
#define VS vector<string>
#define VL vector<ll>
#define rep(i,a) for (ll i=0;i<a;i++)
#define nrep(i,n,a) for (ll i=n;i<a;i++)
#define INF 1145141919810
#define VMIN(vec) *std::max_element(vec.begin(),vec.end())
#define VMIN(vec) *std::max_element(vec.begin(),vec.end())
#define TS(n) to_string(n)

using namespace std;


int main() {
	ll N, K,one,two,three;
	cin >> N >> K;
	VL vec(N);
	rep(i, N) cin >> vec[i];
	sort(vec.begin(), vec.end());
	cout << vec[N - 1] - vec[0] << endl;
	return 0;
}