import java.util.Scanner;

public class ChangingMoney {

	public static int getNumOfCoins(int m) {
		// coins with denominations of 1, 5, and 10
		int coinCount = 0;
		int remainder;
		if (m / 10 == 0 && m % 10 == 0)
			return m / 10;
		coinCount = coinCount + m / 10;
		remainder = m % 10;
		if (remainder >= 5)
			return coinCount + 1 + remainder - 5;
		else
			return coinCount + remainder;
	}

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

		System.out.println(getNumOfCoins(m));
	}

}