C# help

[barsab]

C#:
static void Main(string[] args)

{
double weight, height, body mass;
Console.WriteLine("Enter Weight");
kilo = Convert.ToDouble(Console.ReadLine());
Console.WriteLine("Enter Height");
size = Convert.ToDouble(Console.ReadLine());
vki = weight / (height * height);



Console.WriteLine("Body Mass Index = " + vki);

if (vki <= 18)
{
Console.WriteLine("Low Weight");
}
else if (vki <= 25 )
{
Console.WriteLine("Normal Weight");
}
else if (vki <= 30)
{
Console.WriteLine("Overweight");
}
else if (vki <= 40)
{
Console.WriteLine("Obese");
}
else
{
Console.WriteLine("Extreme");
}
Console.ReadLine();

}

How can I add the network to this code.

For example: "The weight you need to lose so that your body mass index is 24 = 22.24" how can I code this