POJ 1003

#include<iostream>

using namespace std;
int main(){
	float c;
	while(cin>>c,c!=0.00){
		int k=2;
		float sum=0.0;
		sum+=1.0/k;
		while(sum<c){
			k+=1;
			sum+=1.0/k;
		}
		cout<<k-1<<" card(s)"<<endl;
	}
	return 0;
}