#include <iostream>
using namespace std;
int main() {
    int n,h;
    cin>>n;
	if(n%30==0){
		h=n/30;
	}else{
		h=n/30+1;
	} 
	cout<<h;
	return 0;
} 
/**************************************************************
	Problem: 1632
	User: fuhoubin
	Language: C++
	Result: Accepted
	Time:14 ms
	Memory:2072 kb
****************************************************************/