Help me in solving LBJ20 problem

help
,
1

My issue

My code

// Update the code below to solve this problem
import java.util.Scanner;

class Codechef
{
	public static void main (String[] args)
	{
		Scanner read = new Scanner(System.in);
		
		int t = read.nextInt();
		for(int i=0; i<t; i++)
		{
    		int x = read.nextInt();
    		int y = read.nextInt();
    		if()
    		int a=500-x*2;
    		int b=1000-y*4;
    		int m=a+b;
    		System.out.println(m);

		}
	}
}

Learning course: Solve Programming problems using Java
Problem Link: CodeChef: Practical coding for everyone