[백준] 2839번 : 설탕 배달 - Java(자바)

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

import java.util.Scanner;
public class Main {
    public static void main(String args[]) {
        Scanner s= new Scanner(System.in);
        int n=s.nextInt();
        int t=0;
        
        while(n%5!=0){
            n-=3;
            if(n<0){
                t=-1;
                break;
            }
            else t++;
        }
        if(n>0) t+=n/5;
        System.out.print(t);
    }
}