#include<stdio.h>
#include<string.h>

int main(void)
{
	char a[100000000];
	int count=0;
	scanf("%s",a);
	int b=strlen(a);
	while(b>0){
		if(a[b-1]=='4'||a[b-1]=='6'||a[b-1]=='9'||a[b-1]=='0')
			count+=1;
		else if(a[b-1]=='8')
			count+=2;
		count+=2;
		b--;
	}
	count++;
	printf("%d\n",count);
}