How to login, get the number of mails in inbox and logout from the gmail account.

import java.util.List;
import java.util.Scanner;
import java.util.concurrent.TimeUnit;

import org.openqa.selenium.By;
import org.openqa.selenium.WebDriver;
import org.openqa.selenium.WebElement;
import org.openqa.selenium.firefox.FirefoxDriver;

public class InboxCount {

    public static void main(String[] args) {
        Scanner kb = new Scanner(System.in);
        System.out.println("enter ur gmail id: ");
        String id = kb.nextLine();
        System.out.println("enter ur gmail pass: ");
        String password = kb.nextLine();
       
       
        WebDriver driver = new FirefoxDriver();
        driver.manage().timeouts().implicitlyWait(50, TimeUnit.SECONDS);
        driver.get("https://accounts.google.com/ServiceLogin?service=mail&passive=true&rm=false&continue=https%3A%2F%2Fmail.google.com%2Fmail%2F&ss=1&scc=1&ltmpl=default&ltmplcache=2&hl=en&emr=1&elo=1");
        driver.findElement(By.id("Email")).sendKeys(id);
        driver.findElement(By.xpath("//input[@id='Passwd']")).sendKeys(password);
        driver.findElement(By.xpath("//input[@type='checkbox']")).click();
        driver.findElement(By.name("signIn")).click();
       
        String inbox = driver.findElement(By.xpath("//a[@href='https://mail.google.com/mail/u/0/#inbox']")).getText();
        System.out.println(inbox);
       
        //sign out
        driver.findElement(By.xpath("//span[@class='gb_V gbii']")).click();
        driver.findElement(By.linkText("Sign out")).click();
       
        driver.close();
       
    }
}