Triangle area (Java)

import java.util.Scanner;

public class TriangleArea02 {
    public static void main(String[] args){
        Scanner input = new Scanner(System.in);
        System.out.print("Ax: ");
        int ax = input.nextInt();
        System.out.print("Ay: ");
        int ay = input.nextInt();
        System.out.print("Bx: ");
        int bx = input.nextInt();
        System.out.print("By: ");
        int by = input.nextInt();
        System.out.print("Cx: ");
        int cx = input.nextInt();
        System.out.print("Cy: ");
        int cy = input.nextInt();

        if (ax == ay && bx == by && cy==cx) {
            System.out.println("0");
        }
        else {
            int area = -1*(ax*(by-cy) + bx*(cy-ay) + cx*(ay-by))/2;
            System.out.println(area);
        }
    }
}