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

/**************************************************************
	Problem: 1078
	User: lzk
	Language: C++
	Result: Time Limit Exceed
****************************************************************/