// Quiz2.java
// <your name here>

// In Physics, we learn that the Power (P, in watts)
// equals the square of the current (I, in amps) times
// the resistance (R, in ohms).  That is, P = I^2 * R.

// Write a Java program which reads in two doubles, the power
// in watts and the resistance in ohms, and prints out the
// current in amps.

// Your program should handle the two impossible cases:  first,
// if R equals 0 ohms (since this would divide by zero).
// Second, if P/R is negative (since this would make I an
// imaginary number!).

class Quiz2 {
	
	public static void main(String[] args) {
		// your code here!		
	}



	///////////////////////////////////
	// readString, readInt, readDouble
	///////////////////////////////////
	
	public static String readString() {
		java.io.InputStreamReader isr = new java.io.InputStreamReader(System.in);
		java.io.BufferedReader d = new java.io.BufferedReader(isr);
		try { return d.readLine(); } catch (Exception e) { return "error"; }
	}
	public static int readInt() { return Integer.parseInt(readString()); }
	public static double readDouble() {
		return Double.valueOf(readString()).doubleValue();
	}
}