#include <bits/stdc++.h>
using namespace std;
int main(){
    int n,m;
    cin >> n;
    int max,min;
    for(int i = 0; i <n;i++){
        cin >>m;
        if(i == 0){
            min = m;
            max = m;
        }else{
            if(max < m){
                max = m;
            }
            if(min > m){
                min = m;
            }
        }
    }
    cout << max - min;


    return 0;
}