#include<bits/stdc++.h> 
using namespace std; 
int main() { 
  int n, m = 0, s, a = 10000; 
  cin >> n; 
  for(int i = 0;i < n;++i) { 
    cin >> s; 
    if(s > m){ 
      m = s;} 
      if(s < a){ 
        a = s;
        }
         } 
        cout << m-a << endl; 
        }