#include<iostream>
#include<algorithm>
using namespace std;
const int mod=1e9+7;
int main()
{
	int n,a[111];cin>>n;
	for(int i=0;i<n;i++)cin>>a[i];
	sort(a,a+n);
	cout<<a[n-1]-a[0]<<endl;
	return 0;
}