import java.io.*;

class Bod {
	public double x, y;
	
	public Bod(double x, double y) {
		this.x = x;
		this.y = y;
	}
	
	public double vzdalenost(Bod b) {
		return Math.sqrt(Math.pow(this.x - b.x, 2) + Math.pow(this.y - b.y, 2));
	}
}

public class Cv02 {
	public static void main(String[] args) {
		double x, y;
		
		/* Vstup dat */
		System.out.println("Zadej bod A:");
		System.out.print("  X: ");
		x = VstupData.ctiDouble();
		System.out.print("  Y: ");
		y = VstupData.ctiDouble();
		Bod A = new Bod(x, y);
		System.out.println();
		
		System.out.println("Zadej bod B:");
		System.out.print("  X: ");
		x = VstupData.ctiDouble();
		System.out.print("  Y: ");
		y = VstupData.ctiDouble();
		Bod B = new Bod(x, y);
		System.out.println();
		
		System.out.println("Zadej bod C:");
		System.out.print("  X: ");
		x = VstupData.ctiDouble();
		System.out.print("  Y: ");
		y = VstupData.ctiDouble();
		Bod C = new Bod(x, y);
		System.out.println();
		
		
		/* Vypocet */
		double vz = 0;
		vz = A.vzdalenost(B) + B.vzdalenost(C);
		vz-= A.vzdalenost(C);
		
		System.out.println("Prima cesta z bodu A do C je kratsi nez cesta z bodu A do C pres B o "+vz+".");
	}
}