# -*- coding: utf-8 -*-

data = input()

an = []
for val in data.split(' '):
    an.append(int(val))

count = 0
for p in range(1, max(an)+2):
    bn = list(map(lambda x,y=p: x % y, an))
    if bn[0] != bn[2] and (bn[0] - bn[1])*(bn[2] - bn[1]) > 0:
        count += 1
        if p == max(an) + 1:
            count = -1

if count == -1:
    print('INF')
else:
    print(count)