#include<bits/stdc++.h>
using namespace std;

#define int long long

typedef long long ll;
typedef pair<int,int>pint;
typedef vector<int>vint;
typedef vector<pint>vpint;
#define pb push_back
#define mp make_pair
#define fi first
#define se second
#define ln <<endl
#define all(v) (v).begin(),(v).end()
#define rep(i,n) for(int i=0;i<(n);i++)
#define reps(i,f,n) for(int i=(f);i<(n);i++)
#define each(it,v) for(__typeof((v).begin()) it=(v).begin();it!=(v).end();it++)
template<class T,class U>void chmin(T &t,U f){if(t>f)t=f;}
template<class T,class U>void chmax(T &t,U f){if(t<f)t=f;}

int gcd(int a,int b){
    return b?gcd(b,a%b):a;
}

int lcm(int a,int b){
    return a/gcd(a,b)*b;
}

int N,K;
int A[100];

signed main(){
    cin>>N>>K;
    rep(i,N)A[i]=i;

    rep(i,K){
        int a,b;
        cin>>a>>b;
        a--;b--;
        swap(A[a],A[b]);
    }

    int L=1;
    rep(i,N){
        int t=0,p=i;
        do{
            p=A[p];
            t++;
        }while(p!=i);
        L=lcm(L,t);
    }
    cout<<L<<endl;
    return 0;
}