S=set()
L, R = (int(x) for x in input().split())
for i in range(L, R+1):
    if 1 <= i <= 295:
        S.add("C")
    elif 296 <= i <= 416:
        S.add("R")
    elif 417 <= i <= 420:
        S.add("P")

print(len(S)-1)