#include <iostream>
#include <algorithm>

using namespace std;

int main()
{
	int N,K,n,big=1,small=1000;
	cin>>N>>K;
	for(int i=0;i<N;++i)
	{
		cin>>n;
		big  = max(big, n);
		small = min(small, n);
		
	}
	cout<<big-small<<endl;

	fflush(stdin);
	getchar();
	
	return 0;

}