import fractions

def read_data():
    N = int(input())
    K = int(input())
    amida = list(range(N))
    for k in range(K):
        x, y = map(int, input().split())
        amida[x-1], amida[y-1] = amida[y-1], amida[x-1]
    return N, amida

def solve(N, amida):
    cycles = [0] * N
    for idx in range(N):
        if cycles[idx]:
            continue
        find_cycle(N, amida, idx, cycles)
    uniq_cycles = set(cycles)
    lcm = 1
    for c in uniq_cycles:
        lcm = lcm * c // fractions.gcd(lcm, c)
    return lcm

def find_cycle(N, amida, idx, cycles):
    a = amida[idx]
    count = 1
    path = [idx]
    while a != idx:
        path.append(a)
        a = amida[a]
        count += 1
    for a in path:
        cycles[a] = count

N, amida = read_data()
print(solve(N, amida))