#include<bits/stdc++.h>
using namespace std;
int main(){
	int a,l;
	cin>>a;
	if(a%30==0){
		l=a/30;
	}else{
		l=a/30+1;
	}cout<<l;
	}
/**************************************************************
	Problem: 1632
	User: tonghuawei
	Language: C++
	Result: Accepted
	Time:6 ms
	Memory:2072 kb
****************************************************************/