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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);

}

}

}