def f(l):
l[2] += 1
if l[2] >= 60:
l[2] = 0
l[1] += 1
if l[1] >= 60:
l[1] = 0
l[0] += 1
if l[0] >= 24:
l[0] = 0
for _ in range(3):
a,b = input().split()
a = list(map(int,a.split(":")))
b = list(map(int,b.split(":")))
cnt = 0
while a != b:
if int("%02d%02d%02d" % (a[0],a[1],a[2])) % 3 ==0:
cnt +=1
f(a)
if int("%02d%02d%02d" % (a[0],a[1],a[2])) % 3 ==0:
cnt +=1
print(cnt)