TaskC-2016

// TaskC.cpp : Defines the entry point for the console application.
//

#include "stdafx.h"
#include <iostream>
#include <fstream>

using namespace std;

int _tmain(int argc, _TCHAR* argv[])
{
    ifstream ifs("input.txt");
    int N;
    ifs >> N;
    cout << (N + 1) / 3 + 1;

    return 0;
}