#include <iostream>

int main() {
	int n, k;
	std::cin >> n >> k;
	int min = 1000, max = 0;
	for (auto i = 0; i < n; ++i) {
		int num;
		std::cin >> num;
		if (num < min) {
			min = num;
		}
		if (max < num) {
			max = num;
		}
	}
	std::cout << max - min << std::endl;
	return 0;
}