using namespace std;
#include <bits/stdc++.h>
#define BEGIN ios_base::sync_with_stdio(0);cin.tie(0);
#define END return EXIT_SUCCESS;
#define FOR(I,A,B) for(int (I)=(A);(I)<(B);++(I))
#define ALL(C) (C).begin(),(C).end()
int main(int argc,char**argv)
{
	BEGIN
	int N,K;cin>>N>>K;
	vector<int>n(N);
	FOR(i,0,N)cin>>n[i];
	sort(ALL(n));
	cout<<(n[N-1]-n[0])<<endl;
	END
}