#yuki101

a=[[0 for i in range(100)] for j in range(2)]
r=[]
def gcd(a, b):
 while b:
  a, b = b, a % b
 return a

n=int(raw_input())
k=int(raw_input())
for i in range(n):
 r.append(i)
while k:
 x,y=map(int,raw_input().split())
 r[x-1],r[y-1]=r[y-1],r[x-1]
 k-=1
res=1
for i in range(n):
 x=i
 y=0
 while y==0 or x!=i:
  x=r[x]
  y+=1
 res=res*y/gcd(res,y)
print res