#include <bits/stdc++.h>
#define MOD 1000000007

using namespace std;

typedef pair<int,int> P;
typedef pair<int,pair<int,int>> PP;
typedef long long LL;

const double EPS = 1e-8;
const int INF = 1e9;

int dy[] = {0,1,0,-1};
int dx[] = {1,0,-1,0};

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

	return 0;
}