#include<bits/stdc++.h>
using namespace std;
int main() {
	int n,a[105],b=0,c=1005;
	cin>>n;
	for(int i=1;i<=n;i++){
		cin>>a[i];
		if(a[i]>b){
			b=a[i];
		}
		if(a[i]<c){
			c=a[i];
		}
	}
	cout<<b-c<<endl;
	return 0;
}