#include<bits/stdc++.h>
using namespace std;
int main()
{
int n,x;
cin>>n;
if(n>10)x=25*3*5;
else if(n>=7&&n<=10)x=15*3*5;
 else if(n>=3&&n<=6)x=5*3*5;
if(n%120==0)cout<<n/120;
else
cout<<n/120+1;

	return 0;
}

/**************************************************************
	Problem: 1310
	User: hbq
	Language: C++
	Result: Wrong Answer
****************************************************************/