#include<bits/stdc++.h>
using namespace std;
int maxx,minn,a,b;

int main(){
    cin>>a>>b;
    minn=b;
    for(int i=1;i<a;i++){
        cin>>b;
        maxx=max(b,maxx);
        minn=min(b,minn);
    }
    cout<<maxx-minn;
    return 0;
}