View Compilation Error

0_0_19394283_11103.cpp:1:2: error: 'import' does not name a type
  import java.util.Scanner; public class Main {  public static void main(String[] args) {   Scanner sc = new Scanner(System.in);   while(sc.hasNext()){    int a = sc.nextInt();    System.out.println(sum(a));    }   }     public static int sum(int a){   if(a == 1)     return 1;    return (sum(a-1)+1)*2
  ^
0_0_19394283_11103.cpp:1:28: error: expected unqualified-id before 'public'
  import java.util.Scanner; public class Main {  public static void main(String[] args) {   Scanner sc = new Scanner(System.in);   while(sc.hasNext()){    int a = sc.nextInt();    System.out.println(sum(a));    }   }     public static int sum(int a){   if(a == 1)     return 1;    return (sum(a-1)+1)*2
                            ^