#include <iostream>
using namespace std;
int main()
{
    int k;cin >> k;
    int cnt = 0,n = 0;
    while(cnt < k)
    {
        n++;
        for(int i = n;i <= n;i++)
        {
            cnt += 1.0 * 1 / i;
        }
        cnt = 0;
    }
    cout << n;
    return 0;
}