#include<iostream>
using namespace std;
int main(){
	long long n,minn=1000000,maxn=-1000000;
	cin>>n;
	long long a[10000000+10];
	for(int i=1;i<=n;i++){
		cin>>a[i];
		if(a[i]<minn)minn=a[i];
		if(a[i]>maxn)maxn=a[i];
	}
	cout<<maxn-minn;
    return 0;
}