View Compilation Error

0_0_6009189_30633\Main.java:1: class P1000 is public, should be declared in a file named P1000.java
import java.util.*; public class P1000 { 	public static void main(String[] args) { 		Scanner sca = new Scanner(System.in); 		while(true) { 			int a,b,ans; 			a = sca.nextInt(); 			b = sca.nextInt(); 			ans = a + b; 			System.out.println(ans); 		} 	} }