from math import gcd
import functools

int1 = lambda x: int(x) - 1

N = int(input())
K = int(input())
F = list(range(N))
for _ in range(K):
    x, y = map(int1, input().split())
    F[x], F[y] = F[y], F[x]

lst = [1] * N
for i in range(N):
    j = F[i]
    while j != i:
        j = F[j]
        lst[i] += 1

print(functools.reduce(lambda x, y: x // gcd(x, y) * y, lst))