#include <iostream>
using namespace std;
int main()
{
      int n;
      double e=0,sum=1;
      cout<<"n e\n- -----------\n";
      for(n=0;n<=9;n++)
      {
           if(n!=0) 
               sum=n*sum;
           e+=1/sum;
           if(n<=2)
               cout<<n<<" "<<e<<endl;
           else    
               printf("%d %.9lf\n",n,e);
      }
      system("pause");
      return 0;
      
}