using System;

class MainClass {
public static void Main (string[] args) {
double a = 5.6;
double b = 2.3;

double sum = a + b;
double difference = a - b;
double product = a * b;
Console.WriteLine($"Сумма: {sum}");
Console.WriteLine($"Разность: {difference}");
Console.WriteLine($"Произведение: {product}");

}
}