I have this! Please help

import java.io.*;
import java.util.*;
import java.text.*;
import java.math.*;
import java.util.regex.*;

public class Solution {

public static void main(String[] args) {
int i = 4;
double d = 4.0;
String s = "HackerRank ";

Scanner scan = new Scanner(System.in);
int i1;
double d1;
String s1;

i1 = scan.nextInt();
d1 = scan.nextDouble();
s1 = scan.nextLine();
s1 = scan.nextLine();

System.out.println(i+i1);
System.out.println(d+d1);
System.out.println(s+s1);
scan.close();
}
}

What I have tried:

public static void Main(string[] args)
{
int i = 4;
double d = 4.0;
string s = "HackerRank ";

Scanner scan = new Scanner(System.in);
int i1;
double d1;
string s1;

i1 = scan.Next();
d1 = scan.NextDouble();
s1 = scan.nextLine();
s1 = scan.nextLine();

Console.WriteLine(i + i1);
Console.WriteLine(d + d1);
Console.WriteLine(s + s1);
scan.close();
}