#include <bits/stdc++.h>
using namespace std;
int main()
{
	int n,k;
	double a,b;
	cin >> k;
	b = double(k) - 1.0;
	for (int i = 2;i <= 17;i ++)
	{
		if (b == 0.0)
		{
			cout << i;
			break;
		}
		else
		{
			b = b - (1.0 / i);
			continue;
		}
	}
	return 0;
}