> #include <iostream>
> using namespace std;
> int main()
> {  
> 	float number,avg=0.0;int n;
> 	cin>>number;
> 	if(number!=0.0&&number>0.01&&number<5.20)
> 	{for(n=1;avg<number;n++)
> 		avg=avg+(float)1/(n+1);
> 		cout<<n-1<<" "<<"card(s)";
> 	}
> 	
> 	return 0;
> }