#include <bits/stdc++.h>
#define int long long
#define maxn (int)114514
using namespace std;
int n,Minecraft[maxn];
int maxx=INT_MIN,minn=INT_MAX;
signed main(){
	cin>>n;
	for(int i = 1;i<=n;i++){
		cin>>Minecraft[i];
	}
	for(int i = 1;i<=n;i++){
		if(Minecraft[i]>maxx){
			maxx = Minecraft[i];
		}
		if(Minecraft[i]<minn){
			minn = Minecraft[i];
		}
	}
	cout<<maxx-minn<<endl;
	return 0;
}