#include<iostream>
using namespace std;
int n;
int main(){
	cin>>n;
	n/=5;
	cout<<n+n/6;
}

C++ :

#include<iostream>
using namespace std;
int main(){
	int q;
	cin>>q;
	q/=5;
	if(q>=6){
		cout<<q+q/6<<endl;
	}
	else{
		cout<<q<<endl;
	}
	return 0;
}

Python :

# coding=utf-8
s=int(input())
a=int(s//5+s//30)
print(a)