#include<iostream>
#include<vector>
#include<algorithm>

int main() {
	int n, k;
	std::cin >> n >> k;

	std::vector<int> v(n);
	for (int i = 0; i < n; i++) {
		std::cin >> v[i];
	}

	std::cout << *std::max_element(v.begin(), v.end()) - *std::min_element(v.begin(), v.end()) << std::endl;
	return 0;
}