#include<bits/stdc++.h>
using namespace std;
int a[114514];
int main(){
    int n,min1=INT_MAX,/*what's the meaning */max1=INT_MIN;cin>>n;
    for(int i=0;i<n;i++){
        cin>>a[i];
        min1=min(a[i],min1);
        max1=max(a[i],max1);
    }
    cout<<max1-min1;
    return 0;
}