class Example {
	int a,b,c;
	public Example (int x) {
		a = x;
	}
	public Example (int y, int z) {
		b = y;
		c = z;
	}
	public void add () {
		System.out.println(a+b+c);
	}
	public static void main (String[] args){
		Example ob1 = new Example (20,30);
		Example ob2 = new Example (5);
		ob1.add(); //prints 50
		ob2.add(); // prints 5
	}
}