#include <stdio.h>

int main()
{
	int num,tempnum,ans;

	scanf("%d", &num);

	ans = 1;
	if (num == 0) {
		ans += 3;
	}
	else {
		while (num != 0) {
			tempnum = num % 10;
			num /= 10;

			switch (tempnum)	/*fall through*/
			{
			case(8):
				ans++;

			case(0):
			case(4):
			case(6):
			case(9):
				ans++;

			default:
				ans += 2;
			}
		}
	}
	
	printf("%d\n", ans);

}