#include <iostream>
using namespace std;
int main() {
    int max=-501,min=501,a,b;
    cin>>a;
	for(int i=0;i<a;i++){
    	cin>>b;
		if(max<b){
			max=b;
		}
		if(min>b){
			min=b;
		}
	}
	cout<<max-min;
}