> #include<iostream>
> #include<iomanip>
> using namespace std;
> void main()
> {
> 	cin>>setprecision(3);
> 	float number;
>     while(cin>>fixed>>number)
> 	{
> 		float sum=0;
> 		if(number<0.01||number>5.20)
> 		{
> 			cout<<"input error"<<endl;
> 			cin>>fixed>>number;
> 		}
> 		if(number==0)
> 			return;
> 		for(float i=2;sum<number;i++)
> 		{
> 			sum+=(1/i);
> 		}
> 		cout<<i-2<<" card(s)"<<endl;
> 	}
> 	
> }