#include<stdio.h>
long l,r,i,sum,count=0,a[10000];
void sibashuzu(long x)
{
	if (x%48==0) a[count++]=x;
	if (x<=100000000){sibashuzu(x*10+4);sibashuzu(x*10+8);}
	else return;
}
int main()
{
	sibashuzu(4);
	sibashuzu(8);
	while(scanf(\"%d %d\",&l, &r) != EOF)
	{
		sum=0;
		for (i=1;i<=count;i++)
		{
           if (a[i]>=l && a[i]<=r) sum++;
		   
		}
		printf(\"%d\\n\",sum);
	}
    return 0;
}