class Complex {
public double r,i;
Complex(){
}
Complex(double r,double i){
	this.r = r;
	this.i = i;
}
static Complex pow( Complex Z, double n)
{
	double q,r,t;
	q = Z.r*Z.r + Z.i*Z.i;
	if ( q == 0 ){
		return new Complex( 0.0 , 0.0 );
	}else{
		r = Math.sqrt( q );
	}
	if( r == 0 ){
		return new Complex( 0.0 , 0.0 );
	}else if( Z.i > 0 ){
		t = Math.acos( Z.r / r );
	}else{
		t = 2*Math.PI - Math.acos( Z.r / r );
	}
	return new Complex(Math.pow( r,n ) * Math.cos( n * t ),Math.pow( r,n ) * Math.sin( n * t ));
}
	
static Complex sqrt( Complex Z)
{
	double q,r,t;
	q = Z.r*Z.r + Z.i*Z.i;
	if ( q == 0 ){
		return new Complex( 0.0 , 0.0 );
	}else{
		r = Math.sqrt( q );
	}
	if( r == 0 ){
		return new Complex( 0.0 , 0.0 );
	}else if( Z.i > 0 ){
		t = Math.acos( Z.r / r );
	}else{
		t = 2 * Math.PI - Math.acos( Z.r / r );
	}
	return new Complex(Math.sqrt( r ) * Math.cos( t / 2 ),Math.sqrt( r ) * Math.sin( t / 2));
}
	

}