#include <bits/stdc++.h>
using namespace std;
int main(){
    int a[15]={0},m=0,n,x,d,e=0;
    cin>>n;
    for(m=0;m<n;m++){
        cin>>a[m];
        e=e+a[m];
    }
    x=a[0];
    d=a[0];
    for(m=0;m<n;m++){
        if(x>a[m]){
            x=a[m];
        }
        if(d<a[m]){
            d=a[m];
        }
    }
    cout<<d-x;
}
/**************************************************************
	Problem: 1809
	User: linmiaoling
	Language: C++
	Result: Accepted
	Time:11 ms
	Memory:2072 kb
****************************************************************/