import sys
import math


def input(): return sys.stdin.readline().rstrip()


def main():
    N = int(input())
    K = int(input())

    *A, = range(N)
    for i in range(K):
        X, Y = map(int, input().split())
        A[X-1], A[Y-1] = A[Y-1], A[X-1]

    ans = 1

    for i in range(N):
        c = 1
        j = A[i]
        while j != i:
            c += 1
            j = A[j]
        ans = math.lcm(ans, c)

    print(ans)


if __name__ == '__main__':
    main()