poj1607

#include <iostream>
#include <cstdlib>
#include <cstdio>
#include <cstring>
using namespace std;

int n;

int main()
{
//freopen("t.txt", "r", stdin);
puts("Cards  Overhang");
while (~scanf("%d", &n))
{
double ans = 0;
for (int i = 1; i <= n; i++)
ans += 1.0 / (i * 2);
printf("%5d%10.3f\n", n, ans);
}
return 0;
}