from math import gcd
import sys
input = sys.stdin.buffer.readline
sys.setrecursionlimit(10 ** 7)

N = int(input())
*num, = range(N)

K = int(input())
for _ in range(K):
    x, y = map(int, input().split())
    y -= 2
    num[x], num[y] = num[y], num[x]

seen = [0] * N
loop = []
for i in range(N):
    cnt = 0
    while not seen[i]:
        seen[i] = 1
        cnt += 1
        i = num[i]
    if cnt:
        loop.append(cnt)

ans = 1
for x in loop:
    g = gcd(ans, x)
    ans = ans // g * x
print(ans)