from collections import defaultdict
from math import gcd
import sys
readline=sys.stdin.readline

N=int(readline())
K=int(readline())
perm=[i for i in range(N)]
for k in range(K):
    X,Y=map(int,readline().split())
    X-=1;Y-=1
    perm[X],perm[Y]=perm[Y],perm[X]
ans=1
for x in range(N):
    cnt=1
    y=x
    while perm[y]!=x:
        y=perm[y]
        cnt+=1
    ans=ans*cnt//(gcd(ans,cnt))
print(ans)