#include<iostream>
#include<cstdio>
using namespace std;

int main() {
	int N, K;
	scanf("%d", &N);
	scanf("%d", &K);

	int max_value = 1;
	int min_value = 1000;
	for (int i = 0; i < N; i++)
	{
		int temp;
		scanf("%d", &temp);
		max_value = (max_value > temp) ? max_value : temp;
		min_value = (min_value < temp) ? min_value : temp;
	}
	printf("%d\n", max_value-min_value);

	return 0;
}