> #include "iostream"
> using namespace std;
> int main(){
> 	double a;
> 	int count;
> 	double sum;
> 
> 	while(cin>>a){
> 		if(a==0)
> 			cout<<'\n';
> 		else{
> 			count = 2;
> 			sum = 0;
> 			while((sum += (double)(1.0)/(count))<a){
> 				count++;
> 			}
> 			
> 			cout<<count-1<<" card(s)"<<endl;
> 		}
> 	}
> 	return 0;
> }