import java.io.File;
import java.io.FileNotFoundException;
import java.io.PrintWriter;
import java.util.Scanner;

import static java.lang.Math.sqrt;

public class Main {
public static void main(String[] args) throws FileNotFoundException {
    int a,b,c;
    double P,p,square;
    File file = new File("input.txt");
    File file2 = new File("output.txt");
    Scanner s = new Scanner(file);
    a = s.nextInt();
    b = s.nextInt();
    c = s.nextInt();
    PrintWriter pw = new PrintWriter(file2);
    if (a+b > c && b+c > a && a+c > b){
        P = a+b+c;
        p = P/2;

        square = sqrt(p*(p-a)*(p-b)*(p-c));

        String string = String.format("%8.5f", square).replace(',', '.');
        pw.print(P+" "+string);

    } else pw.print(-1);
    pw.close();
    }

    }

var a,b,c:integer;
p,p1,square:real;
input :text;
output :text;
begin
assign(input,'input.txt');
assign(output,'output.txt');
reset(input);
rewrite(output);
read(input,a);
read(input,b);
read(input,c);
if (a+b>c)and(b+c>a)and(a+c>b) then
begin
p := a+b+c;
p1 := p/2;
square := sqrt(p1*(p1-a)*(p1-b)*(p1-c));
write(output,p,' ',square:6:5);
end else write(output,'-1');
close(output);
close(input);

end.