#include<iostream>
#include<stdlib.h>
#include<string.h>
int num[1000010];
void Init()
{
int i,j;
char ch[20];
num[0]=0;
for(i=1;i<1000010;i++)
{
num[i]=num[i-1];
itoa(i,ch,10);
if(strstr(ch,"62")!=NULL||strstr(ch,"4")!=NULL)
continue;
else
num[i]++;
}
}
void main()
{
int n=1000001,m;
printf("%d",n);
Init();
while(scanf("%d%d",&n,&m)!=EOF&&n&&m)
{
printf("%d\n",num[m]-num[n-1]);
}
}