//#include "stdafx.h"
#include<iostream>
using namespace std;

int main(int argc, char* argv[])
{
	double r;
    double n,sum=0;
	cin>>r;
	while(r!=0.00&&r>=0.01&&r<=5.20)
	{
		for(n=2;sum<r;n++)
			sum=sum+1/n;
	cout<<(n-2)<<endl;
	cin>>r;
	}
	return 0;
}