#include <stdio.h>

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

	scanf("%d", &num);

	ans = 1;
	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);

}