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

using ll=long long;
ll mod=1000000007;
ll INF=1LL<<60;

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