#include<iostream>

#include<iomanip>

using namespace std;

int main(){

cout << "n" << ' ' << "e" << endl;

cout << "-" << ' ' << "-----------" << endl;

cout << 0 << ' ' << 1 << endl;

cout << 1 << ' ' << 2 << endl;

cout << 2 << ' ' << 2.5 << endl;

long double sum = 2.5;

long double a = 1;

for (int i = 3; i <= 9; i++){

long double temp = 1;

for (int j = 1; j <= i; j++)

temp *= j;

sum += a/ temp;

cout << i << ' ' << setiosflags(ios::fixed) << setprecision(9) << sum << endl;

}

return 0;

}