#include <bits/stdc++.h>
using namespace std;

int main()
{
int i;
int N;
int K;
int n;
int iMax;
int iMin;

	cin >> N;
	cin >> K;

	iMax = 0;
	iMin = 1000;
	for( i = 0; i < N; i++ )
	{
		cin >> n;
		if( iMax < n ) iMax = n;
		if( iMin > n ) iMin = n;
	}

	cout << iMax - iMin << endl;

	return 0;
}