#include <iostream>
#include <vector>
#include <string>
#include <algorithm>
#include <utility>
#include <iomanip>
using namespace std;
#define diff(x, y) ((x) > (y) ? ((x) - (y)) : ((y) - (x)))

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