#include<iostream>
using namespace std;
int main()
{
	int k = 0;
	cin >> k;
	double sum = 0;
	for (double i = 1;; i++)
	{
		
		if (sum <k)
		{
			sum += 1 / i;
		}
		else
		{
			cout << i;
			break;
		}
	}
	
	system("pause");
	return 0;
}