1 #include<cstdio>
2 #include<cstring>
3 #include<algorithm>
4 #include<cmath>
5 using namespace std;
6 long long mp[10];
7 double ans[10];
8 void init(){
9 mp[0] = mp[1] = 1;
10 for(int i = 2; i <= 9; i++){
11 mp[i] = mp[i-1]*i;
12 }
13 ans[0] = 1.0;
14 ans[1] = 2.0;
15 ans[2] = 2.5;
16 for(int i = 3; i <= 9; i++){
17 ans[i] = ans[i-1]+1.0/mp[i];
18 }
19 }
20 int main()
21 {
22 init();
23 printf("n e\n- -----------\n");
24 printf("0 1\n1 2\n2 2.5\n");
25 for(int i = 3; i <= 9; i++){
26 printf("%d %.9lf\n",i,ans[i]);
27 }
28 return 0;
29 }
