#include <iostream>
#include <algorithm>

int main(){
	int n, k;
	std::cin >> n >> k;
	int max = -1, min = 10000;
	for (int i = 0; i < n; ++i){
		int a;
		std::cin >> a;
		max = std::max(max, a);
		min = std::min(min, a);
	}
	std::cout << max - min << std::endl;
	return 0;
}