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