#include<stdio.h>

int main(void)
{
	long int a;
	int b,count=0;
	scanf("%d",&a);
	if(a==0)
		count++;
	while(a!=0){
		b=a%10;
		if(b==4||b==6||b==9||b==0)
			count+=1;
		else if(b==8)
			count+=2;
		count+=2;
		a=a/10;
	}
	count++;
	printf("%d\n",count);
}