Multiply one BigInteger to another BigInteger

import java.math.BigInteger;

public class Main {
  public static void main(String[] argv) throws Exception {
    BigInteger bi1 = new BigInteger("1234567890123456890");
    BigInteger bi2 = BigInteger.valueOf(123L);

    bi1 = bi1.multiply(bi2);

    System.out.println(bi1);
  }
}

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