#!/usr/bin/env python3
# -*- coding: utf-8 -*-

import array


INF = -1


def is_kadomatsu_seq(seq):
    l = len(seq)
    cond0 = l == 3
    cond1 = len(set(seq)) == l
    cond2 = seq[1] == max(seq) or seq[1] == min(seq)
    return cond0 and cond1 and cond2


def count_p(seq, typecode="I"):
    if is_kadomatsu_seq(seq):
        return INF
    x = max(seq)
    gen_b = lambda p: array.array(typecode, map(lambda y: y % p, seq))
    return sum(1 for p in range(1, x + 1) if is_kadomatsu_seq(gen_b(p)))


def main():
    ans = count_p(array.array("I", map(int, input().split())))
    print("INF" if ans == INF else ans)


if __name__ == '__main__':
    main()