#include<bits/stdc++.h>
using namespace std;


int main() {
 	int n,a[110];
 	cin>>n;
 	int i;
 	for(int i = 0;i < n;i++){
 		cin>>a[i];
	 }
	 sort(a,a+n);
	 cout<<a[n-1]-a[0];
}

/**************************************************************
	Problem: 1809
	User: admin
	Language: C++
	Result: Accepted
	Time:8 ms
	Memory:2076 kb
****************************************************************/