#include<iostream>
using namespace std;
float cards[280];
int main()
{
	cards[0]=0;
	for(int i=1;i<280;i++){
		cards[i]=cards[i-1]+1/float(i+1);
	}
	float c;
	cin>>c ;
	while(c!=0){
		int k=1;
		for(;k<280;k++){
			if(cards[k]>=c)
				break;
		}
		cout<<k<<" cards(s)"<<endl;
		cin>>c;
	}
	return 0;
}