#include <bits/stdc++.h>

[[nodiscard]] static inline constexpr uint_fast32_t solve([[maybe_unused]] const uint_fast32_t N, [[maybe_unused]] const uint_fast32_t K, const std::vector<uint_least32_t>& n) noexcept
{
	const auto [min_itr, max_itr] = std::minmax_element(n.begin(), n.end());
	return *max_itr - *min_itr;
}

int main()
{
	std::cin.tie(nullptr);
	std::ios::sync_with_stdio(false);
	
	uint_fast32_t N, K;
	std::cin >> N >> K;
	std::vector<uint_least32_t> n(N);
	for (auto& n : n) std::cin >> n;

	std::cout << solve(N, K, n) << '\n';
	return 0;
}