fun main() {
    val firstNumber = 10
    val secondNumber = 5
    val thirdNumber = 8

    val result = add(firstNumber, secondNumber)
    val anotherResult = add(firstNumber, thirdNumber)
    val subtractResult = subtract(firstNumber, secondNumber)
    val subtractAnotherResult = subtract(firstNumber, thirdNumber)

    println("$firstNumber + $secondNumber = $result")
    println("$firstNumber + $thirdNumber = $anotherResult")
    println("$firstNumber - $secondNumber = $subtractResult")
    println("$firstNumber - $thirdNumber = $subtractAnotherResult")
}

fun add(numberA: Int, numberB: Int): Int = numberA + numberB

fun subtract(numberA: Int, numberB: Int): Int = numberA - numberB