public class Complex {
	public double re; 
	public double im; 

	public Complex(){
		re=0.;
		im=0.;
	}


	public Complex(double a, double b){
		re=a;
		im=b;
	}

	public static Complex add(Complex a, Complex b){
		Complex c=new Complex(); 
		c.re=a.re+b.re; 
		c.im=a.im+b.im; 
		return c; 
	}

	public void add(Complex a){
		this.re=this.re+a.re; 
		this.im=this.im+a.im;
	}

	public String toString(){
		return "("+this.re+", "+this.im+")";
	}
}