title: how to input a BigInteger type in java
body: <p>when I tried to get an input of type Integer, what I only needed to do was the code below.</p>
  
  <pre><code>Scanner sc = new Scanner(System.in);
  int N = sc.nextInt();
  </code></pre>
  
  <p>but when it comes to BigInteger, 
  I don't know what to do. What can I do to read a BigInteger Type input from the user? </p>