#include<iostream>
using namespace std;
#define MAX 500000
#define SENTINEL 2000000000

int L[MAX/2 + 2], R[MAX/2+2];
int cnt;

void merge(int A[], int n, int left, int mid, int right){
  int n1 = mid - left;
  int n2 = right - mid;
  for( int i = 0; i < n1; i++ )L[i] = A[left + i];
  for( int i = 0; i < n2; i++ )R[i] = A[mid + i];
  L[n1] = R[n2] = SENTINEL;
  int i = 0, j = 0;
  for ( int k = left; k < right; k++ ){
    cnt++;
    if(L[i] <= R[j]){
      A[k] = L[i++];
    }else{
      A[k] = R[j++];
    }
  }
}

void mergeSort(int A[], int n, int left, int right){
  if( left+1 < right){
    int mid = (left + right) / 2;
    mergeSort(A, n, left, mid);
    mergeSort(A, n, mid, right);
    merge(A, n, left, mid, right);
  }
}
int main(){
  int n;cin>>n;
  int a,
  min=1001,max=01;
  for(int i=1;i<=n;i++){
    cin>>a;
    if(min>A)min=a;
    if(max<a)max=a;
  }
  cou<<max-min<<endl;
  return 0;
}
