from functools import reduce


def gcd(a, b):
    m, n = min(a, b), max(a, b)

    while n != 0:
        m, n = n, m % n
    return m


def lcm2(a, b):
    return a * b // gcd(a, b)


def lcm(ns):
    return reduce(lcm2, ns, 1)


def solve(N, K, xys):

    # 1回のループで各位置がどこに移動するのか求める
    # M[i] は i 番目の棒が1回のループでどこに移動するか
    M = list(range(N))
    for i in range(K):
        xi, yi = xys[i]
        M[xi], M[yi] = M[yi], M[xi]

    # 各縦棒のループ数値が何回で元の位置に戻るかを計算 O(?)
    L = []
    for n in range(N):
        p = M[n]
        l = 1
        while p != n:
            p = M[p]
            l += 1
        L.append(l)

    # 各縦棒のループ数の最小公倍数が答え
    return lcm(L)


def main():
    N = int(input())
    K = int(input())
    xys = []
    for i in range(K):
        x, y = map(int, input().split())
        xys.append((x - 1, y - 1))

    a = solve(N, K, xys)
    print(a)


if __name__ == '__main__':
    main()