#include <bits/stdc++.h>
using namespace std;

int main(){
    int n;
    cin>>n;
	if(n % 30 == 0){
		cout<<n / 30;
	}else{
		cout<<n / 30 + 1;
	}
}
 

/**************************************************************
	Problem: 1632
	User: admin
	Language: C++
	Result: Accepted
	Time:14 ms
	Memory:2072 kb
****************************************************************/