#include<bits/stdc++.h>
using namespace std;
int n;
int main(){
	cin>>n;
	int t;
	int maxn=0,minn=10000000;
	for(int i=1;i<=n;i++){
		cin>>t;
		if(t>maxn){
			maxn=t;
		}
		if(t<minn){
			minn=t;
		}
	}
	cout<<maxn-minn;
	
	return 0;
}