import math
n = int(input())
k = int(input())
a = [tuple(map(int, input().split())) for _ in range(k)]
b = [0]*n
for i in range(n):
    j = i
    for x, y in a:
        x -= 1
        y -= 1
        if x == j:
            j = y
        elif y == j:
            j = x
    b[i] = j
r = 1
for i in range(n):
    j = i
    for k in range(1, n+1):
        if b[j] == i:
            break
        j = b[j]
    r = r*k // math.gcd(r, k)
print(r)