#include <iostream>
using namespace std;

int main(void){
	int k,N;
	int max = 0,min=1001;
	cin >> N;
	cin >> k;
	for(int i=0;i<N;i++){
		cin >> k;
		if(max<k)
			max = k;
		if(min > k)
			min = k;
	}
	cout << max - min <<endl;
	return 0;
}