2839 설탕배달

2839번: 설탕 배달 (acmicpc.net)

2839번: 설탕 배달

package DP;

import java.util.Scanner;

public class Bakejoon_2839 {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        int N = sc.nextInt();

        if(N == 4 || N == 7)
            System.out.println(-1);

        else if(N % 5 == 0) {
            System.out.println(N / 5);
        }

        else if(N % 5 == 1 || N % 5 == 3)
            System.out.println((N / 5) + 1);

        else if(N % 5 == 2 || N % 5 == 4)
            System.out.println((N / 5) + 2);

    }
}