#include <iostream>

 using namespace std;

 int main() {

     int jiecheng[];

     jiecheng[] = jiecheng[] = ;

     for (int i=; i<; i++) {

         jiecheng[i] = jiecheng[i-] * i;

     }

     printf("n e\n");

     printf("- -----------\n");

     printf("0 1\n");

     printf("1 2\n");

     printf("2 2.5\n");

     double num[];

     num[] = 2.5;

     for (int i=; i<; i++) {

         num[i] = 1.0/jiecheng[i] + num[i-];

         printf("%d %.9lf\n", i,num[i]);

     }

     return ;

 }