public class Main {
    public static void main(String args[]) {
       int a = 20;
       System.out.println("a = " + a);
       a += 5; //same as a = a + 5
       System.out.println("a = " + a);
       a -= 10; //a = a - 10
       System.out.println("a = " + a);
       a *= 2; //a = a * 10
       System.out.println("a = " + a);
    }
}