#include<bits/stdc++.h>
#include<algorithm>
#include<iostream>
#include<stdio.h>
using namespace std;
const int N=1e6+9;
int a[1000];
int main()
{
    
    

    int n;
    cin>>n;
    int maxx=0,minn=N;
    for(int i=0; i<n; i++)
    {
    
    
        cin>>a[i];
        if(a[i]>maxx)
            maxx=a[i];
        if(a[i]<minn)
            minn=a[i];
    }

    cout<<maxx-minn<<endl;


    return 0;
}