#include<stdio.h>
int main()
{
	int n;
	scanf("%d", &n);
	int ans = 1;
	while (n > 0)
	{
		ans += 2;
		if (n % 10 == 0)ans++;
		if (n % 10 == 4)ans++;
		if (n % 10 == 6)ans++;
		if (n % 10 == 8)ans += 2;
		if (n % 10 == 9)ans++;
		n /= 10;
	}
	printf("%d\n", ans);
	return 0;
}