Codeforces_617A

//Codeforces Round 617A
#include <iostream>
using namespace std;
void slonik(int x)
{
    int answ=0;
    while(x>0)
    {
        x-=5;
        answ++;
    }
    cout << answ;
}
int main()
{
    int x;
    cin >> x;
    slonik(x);
    return 0;
}