#include<bits/stdc++.h>
using namespace std;
using Int = long long;
template<typename T1,typename T2> inline void chmin(T1 &a,T2 b){if(a>b) a=b;}
template<typename T1,typename T2> inline void chmax(T1 &a,T2 b){if(a<b) a=b;}

//INSERT ABOVE HERE
signed main(){
  Int n,k;
  cin>>n>>k;
  vector<Int> v(n);
  iota(v.begin(),v.end(),0);
  for(Int i=0;i<k;i++){
    Int x,y;
    cin>>x>>y;
    x--;y--;
    swap(v[x],v[y]);
  }
  
  Int ans=1;
  vector<Int> used(n,0);
  for(Int i=0;i<n;i++){
    if(used[i]) continue;
    Int j=i,cnt=0;
    while(!used[j]) used[j]=1,j=v[j],cnt++;
    ans*=cnt/__gcd(ans,cnt);
  }
  
  cout<<ans<<endl;
  return 0;
}