> #include<iostream>
> using namespace std;
> int main()
> {int i=2;
> float len=0;
> float length;
> int count=0;
> cout<<"input the length of your cards:"<<endl;
>     cin>>length;
> 	if(length!=0.00)
> 	{
> 	for(i=2;len<length;i++)
> 	{
> 	len=len+1.00/i;
> 	count++;
> 	}
> 	}
> if(length>=0.01&&length<=5.2)	
> cout<<count<<" card(s)"<<endl;
>     return 0;
> }