#include<iostream>
#include<string>
#include<algorithm>
#include<vector>
#include<queue>
#include<stack>
#include<cmath>
#include<cstdlib>
#include<ctime>
using namespace std;
typedef long long ll;
int main() {
	int n, k, min = 10000000, max = 0;;
	cin >> n >> k;
	for (int i = 0; i < n; i++) {
		int a;
		cin >> a;
		if (a < min)min = a;
		if (a > max)max = a;
	}
	cout << max - min << endl;
	return 0;
}