from math import lcm

def root(x):
    if P[x] < 0: return x
    P[x] = root(P[x])  # 経路圧縮
    return P[x]

def merge(x,y):
    x = root(x)
    y = root(y)
    if x == y: return
    if x > y: x,y = y,x
    P[x] += P[y]
    P[y] = x

def same(x,y):
    return root(x) == root(y)

def size(x):
    x = root(x)
    return -P[x]


N = int(input())
P = [-1] * N

K = int(input())
A = list(range(N))
for _ in range(K):
    x,y = map(int,input().split())
    x -= 1
    y -= 1
    A[x],A[y] = A[y],A[x]

for i in range(N):
    merge(i,A[i])

ans = 1
checked = set()
for i in range(N):
    x = root(i)
    if x not in checked:
        checked.add(x)
        ans = lcm(ans,size(x))
print(ans)