#include "stdio.h"
int main()
{
   float i=1,sum=0,x;
  
   scanf("%f",&x);
   if(x!=0)
   {
    	while(sum<x)
    	{
    		sum=sum+1/(i+1);
    		i++;
    	}
    	printf("%d card(s)\n",(int)(i-1));
   }
   return 0;
}