package practice; import java.util.Scanner; // 백준, 2839, 설탕 배달 // for문 돌 때, n / 3 까지만 돈다 public class Solution { public static void main(String[] args) { Scanner sc = new Scanner(System.in); int n = sc.nextInt(); int min = 999999999; for (int i = 0; i <= n / 3; i++) { if ((n - 3 * i) % 5 != 0) { continue; } int j = (n - 3 * i) / 5; if (min > i + j) { min = i + j; } } if (min == 999999999) { System.out.println(-1); } else { System.out.println(min); } } }