#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: wangyiyang
	Language: C++
	Result: Accepted
	Time:9 ms
	Memory:2072 kb
****************************************************************/