import java.util.*
 
fun main(args: Array<String>) {
    val sc = Scanner(System.`in`)
    
}fun main() {
    println("===== Simple Calculator =====")
    
    val num1 = readLine()!!.toDouble()
    val num2 = readLine()!!.toDouble()
    val choice = readLine()!!.toInt()
    
    val result = when(choice) {
        1 -> num1 + num2
        2 -> num1 - num2
        3 -> num1 * num2
        4 -> if(num2 != 0.0) num1 / num2 else "Error: 0 diye bhag kora jabe na"
        else -> "Bhulo option"
    }
    
    println("Folafol = $result")
}