#include <bits/stdc++.h>
using namespace std;
int arr[10005] = {0};
int main(){
   int m;
   cin >> m;
   for(int i = 0; i < m; i++){
      cin >> arr[i];
   }
   int maxN = INT_MIN;
   int minN = INT_MAX;
   for(int i = 0; i < m; i++){
      if(arr[i] > maxN){
         maxN = arr[i];
      }
      if(arr[i] < minN){
         minN = arr[i];
      }
      
   }
   cout << maxN - minN;





   return 0;
}