#include <iostream>
using namespace std;

int main() {
	int n, k, daysCounter = 0;
	double waterPerTree = 0;
	cin >> n;
	int counter = 0;
	while(waterPerTree <= 0.5) {
		waterPerTree += (double) 1 / (n - counter++);
		daysCounter++;
		cout << counter;
	}
	k = n - daysCounter + 1;
	cout << k;
	return 0;
}