#include<bits/stdc++.h>
using namespace std;
int main()
{
	float x,n=0,s=0;
	cin>>x;
	while(s<=x){
		n+=1;
		s+=1.0/n;
	}
	cout<<n;
 return 0;
 }

/**************************************************************
	Problem: 1078
	User: ccf
	Language: C++
	Result: Accepted
	Time:14 ms
	Memory:2072 kb
****************************************************************/