百炼1003

#include<bits/stdc++.h>
using namespace std;
int main(){
	double num;
	double i;
	while(cin>>num&&num){
		double sum=0.0;
		for( i=2;sum<=num;i++)
		{   
		sum+=(1.0/i);
	    }
	    cout<<i-2<<" card(s)"<<endl;
	 }
	return 0;
}