mod = list(map(int, input().split(' ')))
a = mod[0]
b = mod[1]
c = mod[2]

count = 0
for i in range(1, 1000):
	am = a % i
	bm = b % i
	cm = c % i
	if am == bm or am == cm or bm == cm:
		continue
	elif (am < bm and cm < bm) or (bm < am and bm < cm):
		count += 1
		
print(count)