백준2839: 설탕 배달

문제

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

문제 풀이

import java.util.*;

public class Main {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);

        int n = sc.nextInt();
        int answer = 0;

        while (n > 0) {
            if (n % 5 == 0) {
                answer += n / 5;
                break;
            } else {
                n -= 3;
                answer++;
            }

            if (n < 0) {
                answer = -1;
            }
        }
        System.out.println(answer);
    }
}