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

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