백준 Kotlin 2839번 : 설탕 배달

https://www.acmicpc.net/problem/2839

2839번: 설탕 배달

---

import java.util.*

fun main() {
    val sc = Scanner(System.`in`)

    var a = sc.nextInt()
    var sum = 0
    while(true) {
        if(a % 5 == 0) {
            sum += a / 5
            println(sum)
            break
        } else {
            a -= 3
            sum++
        }
        if (a < 0) {
            println("-1")
            break
        }
    }
}