#include <bits/stdc++.h>
#define FOR(i,a,b) for(int i = (a); i < (b); ++i)
using namespace std;

int main() {
	int n, k, nn[1010];
	cin >> n >> k;
	FOR(i, 0, n) {
		cin >> nn[i];
	}
	sort(nn, nn + n);
	cout << nn[n - 1] - nn[0] << endl;
	return 0;
}