#include <algorithm>
#include <cassert>
#include <limits>
#include <queue>
#include <vector>
#include <iostream>

int main() {
	int n;
	std::cin >> n;
	int day = 1;
	while (n > 0) {
		if (day % 7 == 0) n += 6;
		n -= 1;
		if (n == 0) break;
		++day;
	}
	std::cout << day << std::endl;

}