#!/usr/bin/env python3

import array
import functools
import itertools
import math


def lcm(a, b):
    return a // math.gcd(a, b) * b


def ret_iter_num(amida, i):
    x = i
    for j in itertools.count(1):
        x = amida[x]
        if x == i:
            return j


def solve(amida, n):
    return functools.reduce(lcm, (ret_iter_num(amida, i) for i in range(n)))


def main():
    n = int(input())
    k = int(input())
    amida = list(range(n))
    for _ in range(k):
        x, y = map(lambda z: int(z) - 1, input().split())
        amida[x], amida[y] = amida[y], amida[x]
    print(solve(amida, n))


if __name__ == '__main__':
    main()