import java.util.Scanner;

public class CoinChangeDynamicProgramming {

    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        int m = scanner.nextInt();
        System.out.println(getChange(m));
    }

    public static int getChange(int money) {
        // denominations: 1, 3, 4
        int[] denominations = { 1, 3, 4 };
        int[] minNumCoins = new int[money + 1];
        for (int m = 1; m < minNumCoins.length; m++) {
            minNumCoins[m] = Integer.MAX_VALUE;
            for (int i = 0; i < denominations.length; i++) {
                if (m >= denominations[i]) {
                    int numCoins = minNumCoins[m - denominations[i]] + 1;
                    if (numCoins < minNumCoins[m]) {
                        minNumCoins[m] = numCoins;
                    }
                }
            }
        }
        return minNumCoins[money];
    }

}