A.cpp

/*****                                            
 *                                                   __Bismillahir Rahmanir Rahim__
 *                                          American International University Bangladesh (AIUB) 
 *                                                         Hadiur Rahman Nabil
                                                                 
                                                               
                                                          
*****/
#include <bits/stdc++.h>

using namespace std;
typedef long long ll;
 

 
int main()
{

  int x;
  cin>>x;
  if(x%5==0)
  {
    cout<<x/5;
  }
else 
{
  cout<< (x/5)+1;
}
return 0;
}