// editor3
#include<stdio.h>
int main()
{
    int lower,uooer,sum = 0;
    scanf("%d",&lower);
    scanf("%d",&upper);
    if(loer < 0 || upper < 0 || lower > upper)
    {
        printf("Invalid input\n");
        return 0;
        
    }
    for(int i = lower; i <= upper; i++)
    {
        if(i & 7 ==0)
        {
            sum += 1;
        }
    }
    printf("%d\n" , sum);
    return 0;
}