#include <iostream>
#include <vector>
#include <algorithm>

using namespace std;

int main()
{
	int N, K;

	cin >> N >> K;

	vector<int> n(N);
	for( int i = 0; i < N; i++ ) {
		cin >> n[i];
	}
	sort( n.begin(), n.end() );
	cout << ( n[N-1] - n[0] ) << endl;
	return 0;
}