#include<bits/stdc++.h>
using namespace std;

int main(){
    int n;
    cin >> n;
    vector<int>b;
    while(n--){
        int a;
        cin >> a;
        b.push_back(a);
    }
    int max_i = *max_element(b.begin(), b.end());
    int min_i = *min_element(b.begin(),b.end());
    cout << max_i - min_i;
    return 0;
}