#include<iostream> 
using namespace std;
int main(){
	int n,maxn=-1,minn=1001;
    cin>>n;
	for(int i=1;i<=n;++i){ 
	int tmp; 
	cin>>tmp; 
	maxn=max(tmp,maxn);
	minn=min(tmp,minn);
	} 
	cout<<maxn-minn;
	return 0; 
}