import math

n = int(input())

perm = [i for i in range(n)]
k = int(input())
for _ in range(k):
  x, y = map(int, input().split())
  x -= 1
  y -= 1
  perm[x], perm[y] = perm[y], perm[x]

parent = [None for _ in range(n)]
cnt = {}
for src in range(n):
  if not parent[src] is None:
    continue

  cur = src
  while parent[cur] is None:
    cnt[src] = cnt.get(src, 0) + 1
    parent[cur] = src
    cur = perm[cur]

ans = 1
for _, v in cnt.items():
  ans = math.lcm(ans, v)

print(ans)