11150 - Cola

#include <iostream>
#include <string>
#include <iomanip>
#include <cmath>
#include<sstream>
using namespace std;

int main()
{
	int total, supp, div;
	while (cin >> total) {
		div = total;
		while (div > 2) {
			supp = div % 3;
			div = div / 3;
			total = total + div;
			div = div + supp;
		}
		if (div == 2) {
			total += 1;
		}
		cout << total << endl;
	}
}