import sys
from math import gcd
sys.setrecursionlimit(10**7)
def I(): return int(sys.stdin.readline().rstrip())
def MI(): return map(int,sys.stdin.readline().rstrip().split())
def LI(): return list(map(int,sys.stdin.readline().rstrip().split()))
def LI2(): return list(map(int,sys.stdin.readline().rstrip()))
def S(): return sys.stdin.readline().rstrip()
def LS(): return list(sys.stdin.readline().rstrip().split())
def LS2(): return list(sys.stdin.readline().rstrip())


N,K = I(),I()

A = [i for i in range(N+1)]
for _ in range(K):
    X,Y = MI()
    A[X],A[Y] = A[Y],A[X]

flag = [0]*(N+1)
ans = 1
for i in range(1,N+1):
    if flag[i]:
        continue
    r = 1
    a = A[i]
    while a != i:
        r += 1
        a = A[a]
    ans = ans*r//gcd(ans,r)

print(ans)