#include <iostream>
using namespace std;

int main() {
    int n;
    cin>>n;
    int a;
    cin>>a;
    int max=a,min=a;
    while(n>0){
        cin>>a;
        max=(a>max)?a:max;
        min=(a<min)?a:min;
        n--;
    }
    cout<<(max-min)<<endl;
}