l = list(map(int,input().split()))

def calc(p):
    s = [i % p for i in l]
    ss =set(s)
    if len(ss) < 3:return False
    if max(s) == s[1] or min(s) == s[1]:
        return True
    else:
        return False

ans = 0
if calc(1001):
    print('INF')
else:
    for p in range(1,1001):
        if calc(p):
            ans += 1
    print(ans)