#include<bits/stdc++.h>
using namespace std;
int main(){
    int n,z;
    cin>>n;
    z=(n+30-1)/30;
    cout<<z;
}
/**************************************************************
	Problem: 1632
	User: sucongyi
	Language: C++
	Result: Accepted
	Time:8 ms
	Memory:2072 kb
****************************************************************/