L, R = map(int,input().split())

if L <= 295:
    L_lan = 1
elif L <= 416:
    L_lan = 2
else:
    L_lan = 3

if R <= 295:
    R_lan = 1
elif R <= 416:
    R_lan = 2
else:
    R_lan = 3

print(R_lan - L_lan)