I've solved the problem but it returns me "Wrong Answer"
I've checked my answers on my PC and everything was correct!
So please tell me how exactly to write the input and output.

> So please tell me how exactly to write the input and
output.

Look, here's my C++ code:

// @JUDGE_ID: 10231XX C C++
#include <stdio.h>
#include <math.h>

double R, H;

double calculate() { /*.........*/ }

int main()
{
    scanf("%lf%lf",&H,&R);
    printf("%.3lf\n", calculate());
    return 0;
}