import java.util.*;
public class Point{
	public  static void main(String[] args)
	{OnePoint p=new OnePoint();
		p.SetPoint();
		p.Distance();
	}
}
class OnePoint{
	
	public void SetPoint()//設(shè)置坐標(biāo)
	{ Scanner in=new Scanner(System.in);  
		System.out.print("Please input (x,y,z):");
		//鍵盤獲取
	     x=in.nextFloat();
				y=in.nextFloat();
					z=in.nextFloat();
	}
	public void Distance()
	{
	 System.out.println("The distance from the start_point is:"+Math.sqrt(x*x+y*y+z*z));
	}
	private float x;
	private float y;
	private float z;
}