Series

import java.io.*;
public class series
{

    public static void main(String args[])throws IOException
    {
        long n;
        DataInputStream obj=new DataInputStream(System.in);
        System.out.println("Enter n");
        n=Integer.parseInt(obj.readLine());
        double bigsum = 0.0;
        for(long j = 1; j <= n; j++) {
            long sum=1, product=1;
            double computedterm;
            for(long i=2; i <= (j + 1) ;i++)
            {
                sum+=i;
                product*=i;
            }
            computedterm = sum * 1.0 / product;
            bigsum += computedterm;
        }
        System.out.println( bigsum );
    }
}