...

import java.util.Scanner;
public class Main
{
	public static void main(String[] args) {
	    Scanner mk = new Scanner(System.in);
	    int a, b, Tong;
		System.out.print("Nhap a: ");
		a = mk.nextInt();
		System.out.print("Nhap b: ");
		b = mk.nextInt();
		Tong = a + b;
		System.out.print("a+b = "+Tong);
	}
}