foo.cpp:1:1: error: 'import' does not name a type
 import java.math.BigInteger;
 ^~~~~~
foo.cpp:2:1: error: 'import' does not name a type
 import java.util.Scanner;
 ^~~~~~
foo.cpp:4:1: error: expected unqualified-id before 'public'
 public class Main {
 ^~~~~~