#include<iostream>
#include<algorithm>
#include<vector>
using namespace std;
int main(){
    int n;
    cin >> n;
    vector<int>arr(n);
    for(int i=0;i<n;i++){
        cin >> arr[i];
    }
    sort(arr.begin(),arr.end());
    cout << arr.back()-arr[0]<<endl;
    return 0;
}