#include <algorithm>
#include <iostream>
#include <string>
#include <vector>
#define REP(i,n) for (int i=0;i<(n);i++)

using namespace std;

int main(){
	int N, nmin = 20000000, nmax = -20000000, tmp;
	cin >> N >> tmp;
	
	
	REP(i, N){
		cin >> tmp;
		nmax = max(nmax, tmp);
		nmin = min(nmin, tmp);
	}
	

	cout << nmax - nmin << endl;
	return 0;
}