#include<cstdio>

 #include<cstring>

 #include<algorithm>

 #include<cmath>

 using namespace std;

 long long mp[];

 double ans[];

 void init(){

     mp[] = mp[] = ;

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

         mp[i] = mp[i-]*i;

     }

     ans[] = 1.0;

     ans[] = 2.0;

     ans[] = 2.5;

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

         ans[i] = ans[i-]+1.0/mp[i];

     }

 }

 int main()

 {

     init();

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

     printf("0 1\n1 2\n2 2.5\n");

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

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

     }

     return ;

 }