#include<bits/stdc++.h>
using namespace std;
int main(){
   
	int k,n=0;
	cin>>k;
	double Sn=0;
	for(;Sn<=k;n++,Sn+=1.0/n);
	cout<<n;
}


#include<bits/stdc++.h>
using namespace std;

int main(){
   
	int k,n=0;
	double Sn=0.0;
	cin>>k;
	
	while(Sn<=k){
   
		n++;
		Sn+=(1.0/n);
	
	}
	cout<<n;
	
}