As far as I know the first test of each problem is the test from the statement. This is my sollution.
import java.util.Locale;
import java.util.Scanner;


public class t1582 {
    public static void main(String[] args) {
        Locale.setDefault(Locale.US);
        Scanner in = new Scanner(System.in);
        double
        k1 = in.nextDouble(),
        k2 = in.nextDouble(),
        k3 = in.nextDouble();
        System.out.print(Math.round(1000.0/(k2/k3+k2/k1+1)*k2));
    }
}
On my PC on the first ans second test the answer is right.
But I get WA on 1 test!!!! What is it!!! May be something with Java....

It was Java problem, 'cause just few minute ago the previous sollution was AC.